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There are very few genuinely blue plants. Not blue-green, not grey with a blue cast — actually blue. Senecio mandraliscae, known everywhere as blue chalksticks or blue chalk fingers, is one of them: a low spreading succulent whose finger-shaped leaves are coated in a powdery wax so intensely silver-blue that it looks artificial next to ordinary foliage. Last updated: August 2026 Designers use it constantly for that reason. A drift of blue chalksticks between dark green shrubs and warm gravel does something no other plant does. And it happens to be one of the least demanding succulents in cultivation — it wants sun, sharp drainage, and to be left completely alone. This guide covers everything: correct identification (it is regularly confused with two near-identical relatives), care indoors and out, propagation, and the design pairings that make it shine. Blue Chalksticks at a Glance Requirement What it wants Botanical name Senecio mandraliscae, now reclassified as Curio repens / Curio mandraliscae Common names Blue chalksticks, blue chalk fingers, blue finger senecio Light Full sun to very bright light — 6+ hours Water Deeply and rarely; let soil dry completely. Drought tolerant once established. Soil Gritty, fast-draining cactus or succulent mix Size 12–18 inches tall, spreading 2–3 feet Hardiness USDA zones 9–11; damaged below about 25°F Growth rate Moderate to fast, spreading by rooting stems Flowers Small white to cream clusters in summer — insignificant, often removed Toxicity Toxic to cats, dogs, and humans if ingested Difficulty Easy — one of the most forgiving succulents in full sun Identification: Which Blue Senecio Do You Actually Have? Three blue succulents are sold almost interchangeably, and nurseries mix them up routinely. The differences are easy once you know them. Plant Leaf shape Length Habit Tell-tale sign Senecio mandraliscae (blue chalksticks) Slender cylindrical fingers, slightly upcurved, pointed 3–5 in Spreading mound 12–18 in tall Longest leaves of the three; deepest blue; grows as ground cover Senecio serpens (dwarf blue chalksticks) Short, stubby, upright cylinders 1–2 in Compact mat 6–8 in tall Miniature version; tidier, slower, better in small pots Senecio talinoides var. mandraliscae Cylindrical, more erect 2–4 in Upright, shrubbier Grows up rather than out; often sold as the same plant All three want identical care, so a mislabeled plant is not a problem — just be aware that if you bought "blue chalksticks" for a 3-foot ground cover drift and it stays a neat 6-inch cushion, you have Senecio serpens. Do not confuse any of them with Senecio rowleyanus, string of pearls, or Senecio radicans, string of bananas — those are trailing bead-leaved relatives with completely different form. See our guides to string of pearls and string of bananas. A note on the name: botanists moved these plants out of Senecio into the genus Curio. You will see Curio repens and Curio mandraliscae on newer labels. It is the same plant; the trade still overwhelmingly uses Senecio. Light Blue chalksticks needs sun, and its color depends on it. That extraordinary blue comes from a waxy epicuticular coating the plant produces to protect itself from intense light — a bloom, in horticultural terms. In weak light the plant produces less wax, and the leaves shift toward plain green. Outdoors, give it full sun. In the hottest desert climates a little afternoon shade prevents scorching, but in most regions all-day sun is ideal. Indoors, this is a south-facing-window plant and nothing less. An east or west window will keep it alive but stretched and greener. If your brightest window is not bright enough, add a full-spectrum LED — see our grow lights comparison. If you want blue-grey foliage in a genuinely dim room, no succulent will do it; look at our low light plants collection instead. Important: that waxy bloom rubs off permanently on contact. Handle the plant by the stems, not the leaves, and do not wipe or polish the foliage. Fingerprint marks stay until new leaves grow. Watering Blue chalksticks stores water in every leaf and expects long dry spells. The rule is simple: soak thoroughly, then let the soil dry out completely before watering again. In the ground, established plants often need no supplemental water at all outside of extended drought — a deep watering every few weeks in high summer is generous. In containers, expect to water roughly every two to three weeks in summer and once a month or less in winter, always checking that the soil is dry to the bottom first. Water at the base rather than over the foliage. Water sitting in the crowded leaf clusters invites rot, and it spots the wax. Reading the plant: slightly wrinkled, softening leaves mean it is thirsty — water it and it plumps within a day. Yellowing, translucent, mushy leaves and a blackening stem base mean the opposite, and that is far more dangerous. See our overwatered vs underwatered guide and root rot treatment guide if you are unsure, plus how often to water succulents for a seasonal rhythm. Soil and Potting Drainage is the entire game. Use a commercial cactus and succulent mix amended with extra perlite, pumice, or coarse sand — aim for something that water runs straight through. In garden beds with clay soil, plant on a mound, berm, or raised bed with grit worked in; blue chalksticks will not survive a winter sitting in cold wet clay. Containers must have drainage holes. Terracotta is the best choice because it wicks moisture away through the walls — see terracotta vs plastic pots. Choose a wide, shallow pot rather than a deep one; the root system is shallow and spreading. Our soil guide covers mixes in detail. Repot only every two or three years, or when the plant has filled its container. Spring is the best time. Blue chalksticks is untroubled by being slightly cramped. Temperature, Hardiness, and Feeding Blue chalksticks is hardy in USDA zones 9 through 11. It handles brief dips to the mid-20s°F with some leaf damage, but a hard freeze will kill it. In colder zones, grow it in a container and move it indoors before the first frost, or treat it as a summer annual in landscape plantings. It loves heat and shrugs off the kind of reflected warmth from paving and walls that stresses most plants. High humidity is its real enemy — in humid summer climates, airflow and sharp drainage matter more than anything else. Feeding is barely necessary. A half-strength dose of balanced or succulent fertilizer once or twice in spring and early summer is plenty. Overfeeding produces soft, floppy, greener growth — the opposite of what you want. See our fertilizer guide. Pruning and Maintenance Blue chalksticks spreads by stems that lie down and root where they touch soil, which is how it forms drifts — and also how it eventually gets untidy, with bare woody centers and leggy outer growth. The fix is easy and should be done every couple of years in spring: shear the whole planting back by a third to a half. It regrows dense and compact from the cut stems, and every piece you removed is a cutting you can plant elsewhere. Pinch back individual stems any time they reach where you do not want them. Many gardeners remove the flower stalks as they appear. The small cream flowers are unremarkable, they smell faintly unpleasant to some noses, and flowering diverts energy that would otherwise go into foliage. That said, leaving them does no harm. Propagation: Free Plants, Every Time This is one of the easiest succulents to propagate. Stem cuttings root at close to a 100% success rate. Cut a 3–5 inch stem tip with clean shears, ideally in spring or summer. Strip the lowest leaves so the bottom inch of stem is bare. Let the cutting sit dry in a shaded spot for two to four days so the cut end callouses over. Skipping this step is the main cause of rot. Insert the bare stem into dry gritty mix, or simply lay it on the soil surface where you want it to spread. Wait a week, then water lightly. Roots typically form within two to three weeks. Division works too: lift a spreading clump, separate rooted sections, and replant. Individual leaves do not propagate reliably for this species, unlike echeverias — you need a piece of stem. Our succulent propagation guide compares methods across genera. Troubleshooting Symptom Cause Solution Leaves yellow, translucent, mushy; stem black at base Overwatering or poor drainage Stop watering. Take healthy tip cuttings and restart in fresh gritty mix — a rotted base rarely recovers. Blue color faded to green Not enough light, or excess fertilizer Move to full sun and stop feeding. New growth returns blue. Stems long and sparse, leaves widely spaced Insufficient light Relocate to full sun and shear back by half to force compact regrowth. Wrinkled, deflated, curling leaves Underwatering Water deeply; leaves plump up within 24–48 hours. Bare woody center, growth only at the edges Natural aging of a spreading mat Shear the planting back hard in spring; replant cuttings into the gaps. Dry brown papery patches after relocation Sunburn from a sudden move into intense sun Acclimate gradually over two weeks; damaged leaves will not recover but new growth will be fine. White cottony clusters in leaf joints Mealybugs — the most common pest Dab with 70% isopropyl alcohol, then treat with neem or insecticidal soap weekly for three weeks. See our pest identification guide. Small flies hovering over the soil Fungus gnats from soil kept too damp Let the soil dry fully; see our fungus gnat guide. Design Ideas and Companion Plants Blue chalksticks earns its place through contrast. A few combinations that reliably work: Blue against gold: plant it beside Sedum 'Angelina' or Sedum adolphii for an electric blue-and-chartreuse carpet. Our sedum varieties guide covers the options. Blue against burgundy: pair with dark Aeonium 'Zwartkop' or a red-leaved Echeveria — see our echeveria care guide. Blue with silver and texture: combine with Agave, Dymondia, or ornamental grasses in a gravel garden. Erosion control on slopes: its rooting stems knit together into a drought-proof mat that stabilizes banks with no irrigation. Container spiller: the "spiller" element in a mixed succulent pot alongside upright aloes and mounding crassulas. Modern architectural planting: a monoculture drift of nothing but blue chalksticks against concrete or dark stone. Restraint reads as design. Frequently Asked Questions Is Senecio mandraliscae the same as Curio repens? Yes — the plant was reclassified into the genus Curio. Both names refer to the same species. Why is my blue chalksticks turning green? Almost always insufficient light. The blue is a protective wax the plant produces in strong sun. More sun, less fertilizer, and new growth comes back blue. Can it grow in a pot indoors? Yes, in the sunniest window you have, in a shallow terracotta pot with gritty mix, watered only when bone dry. Expect somewhat greener, looser growth than outdoors. Is it safe for pets? No. Senecio species are toxic to cats and dogs if chewed. See our pet-safe houseplants guide or shop pet-friendly plants. How fast does it spread? A single plant typically covers two to three feet within two growing seasons in good conditions. Space plants 18 inches apart for a solid drift. Will it survive winter? Only in zones 9–11. Elsewhere, grow it in a container you can bring inside before frost. Should I let it flower? Your choice — the flowers are minor. Removing the stalks keeps the plant tidier and pushes energy into foliage. The Short Version Give blue chalksticks the sunniest, driest, grittiest spot you have and then ignore it. Do not touch the leaves, do not feed it, and do not water it on a schedule. Shear it back every couple of springs and plant the cuttings. In return you get one of the only truly blue plants you can grow, spreading itself across ground where most plants would sulk. Browse our succulents collection, string plants, and easy care plants, or read types of succulents and our succulent care guide to go further. Frequently Asked Questions How do you care for blue chalksticks? Give Senecio mandraliscae full sun, fast-draining gritty soil and infrequent deep watering. Let the soil dry completely between waterings, and cut back sharply in winter. It needs no fertilizer beyond one light feed in spring. The main way people kill it is watering too often in heavy potting mix. What is the blue finger succulent called? Blue finger succulent is the common name for Senecio mandraliscae, also sold as blue chalksticks, blue chalk fingers or Curio mandraliscae after a recent botanical reclassification. All four names refer to the same plant: a spreading South African succulent with powdery blue-green, finger-shaped leaves. How often should you water Senecio mandraliscae? Water deeply about every two to three weeks in summer, and only once every four to six weeks in winter. Always check first that the soil is dry several inches down. Its plump leaves store water, so it recovers from drought far more easily than from soggy roots. Why is my blue chalksticks plant losing its blue color? The blue comes from a fine waxy coating called farina that protects leaves from sun. Too little light makes new growth greener and stretched, while handling or overhead watering rubs the coating off. Move the plant into full sun and water at soil level to keep the color. Can blue chalksticks be used as a groundcover? Yes, and it is one of the best succulent groundcovers in USDA zones nine through eleven. It spreads about two to three feet wide and eight to twelve inches tall, roots along its stems, and handles heat, drought and coastal salt. Space plants a foot apart for quick coverage. How do you propagate blue chalksticks? Take a three to five inch stem cutting, strip the lowest leaves, and let the cut end callus in dry shade for two or three days. Then push it into barely moist cactus mix. Roots form in two to three weeks. Spring and early summer give the fastest results. Is Senecio mandraliscae toxic to pets? Yes, mildly. Like other Senecio species it contains compounds that can cause vomiting, drooling or skin irritation if chewed by cats or dogs. It is not usually life-threatening, but plant it out of reach of curious pets and wash your hands after taking cuttings. About the author Written and reviewed by The Divine Roots Growing Team — the horticulture team at Divine Roots Botanicals, who propagate, grow on and ship every plant we sell. Care advice here reflects what we see in our own greenhouse, not just what is repeated online.

Sedum — stonecrop — is the succulent genus that does everything. Some species creep flat across gravel like a living carpet. Others stand three feet tall and carry broccoli-sized flower heads that butterflies mob in September. A few trail from hanging baskets in ropes of plump beads. And one, Sedum reflexum 'Blue Spruce', looks so convincingly like a miniature conifer that people bend down to touch it. They share one wonderful quality: they are almost impossible to kill by neglect. Sedums are the plants you put in the spot where nothing else survives — the hot strip beside the driveway, the shallow soil over a rock ledge, the pot you forget to water for a month. This guide covers 18 sedum varieties grouped by how you would actually use them, with a detailed section on 'Blue Spruce' since it is the variety people search for most, plus the care rules that apply across the genus. Understanding Sedums: Two Groups That Matter Before choosing varieties, know that sedums split into two functional groups with genuinely different behavior: Creeping / evergreen sedums Upright / border sedums Height 2–8 inches 12–36 inches Habit Spreading mats, trailing stems Clumping upright stems Winter behavior Evergreen or semi-evergreen foliage Die back to the ground; regrow each spring Best for Ground cover, rock gardens, green roofs, containers, walls Perennial borders, cut flowers, pollinators Botanical note Still classed as Sedum Many reclassified as Hylotelephium Examples 'Blue Spruce', 'Angelina', 'Dragon's Blood' 'Autumn Joy', 'Matrona', 'Purple Emperor' Sedum reflexum 'Blue Spruce' — The Conifer Look-Alike If you searched for this one specifically, here is everything worth knowing. What it looks like: narrow needle-like blue-grey leaves, about half an inch long, arranged in dense spirals along creeping stems that lift at the tips. The overall effect is a spruce seedling that has been shrunk and flattened. It forms a loose mat 4–6 inches tall spreading 18–24 inches, and in early summer sends up 8-inch stems topped with clusters of bright yellow star-shaped flowers. Names: sold as Sedum reflexum, Sedum rupestre 'Blue Spruce', blue stonecrop, or blue spruce stonecrop. All the same plant — the species was reclassified, so both Latin names circulate. Where it excels: spilling over retaining walls, filling gaps between pavers, edging gravel paths, planted into green roofs and living walls, and as the trailing blue element in mixed succulent containers. The color contrast against dark stone or against golden 'Angelina' is genuinely striking. Requirement 'Blue Spruce' wants Light Full sun — 6+ hours. Color fades to plain green in shade. Soil Lean, gritty, fast-draining. Poor soil produces better color than rich soil. Water Very little once established. Water deeply and infrequently; tolerates real drought. Hardiness USDA zones 3–9. Evergreen in mild winters, bronzing in cold. Fertilizer None needed. Feeding causes floppy, weak growth. Spread Moderate — roots wherever stems touch soil, easy to pull back. Growing it indoors: possible but demanding, because it needs more direct sun than most windows deliver. Give it your brightest south-facing sill, a terracotta pot, gritty mix, and water only when completely dry. If stems stretch and the blue fades, it is asking for more light — our grow light guide covers supplementation. Propagation could not be simpler: break off a stem, lay it on soil, and it roots within a couple of weeks. Even fallen leaves root themselves. This is the plant to use if you want to fill a large area for free. Creeping and Trailing Sedum Varieties 1. Sedum rupestre 'Angelina' The golden twin of 'Blue Spruce'. Identical needle-like form, but chartreuse-yellow foliage that turns coppery orange in cold weather. Four inches tall, spreading readily. Planted beside 'Blue Spruce' it creates one of the best color pairings in succulent gardening. 2. Sedum spurium 'Dragon's Blood' Flat rounded scalloped leaves in deep bronze-red, deepening to burgundy in sun and cold, with rose-red summer flowers. Forms a tight 4-inch mat that spreads fast. The most reliable red-foliage ground cover sedum. 3. Sedum spurium 'Tricolor' Same habit as 'Dragon's Blood' but with green leaves irregularly edged in cream and pink. Needs full sun to hold variegation. Slightly less vigorous. 4. Sedum album 'Coral Carpet' Tiny bead-like green leaves on a dense 2–3 inch carpet that flushes coral-red in winter and drought. White flowers. Superb between stepping stones and one of the toughest green-roof plants available. 5. Sedum acre (goldmoss stonecrop) Very fine bright green foliage forming a moss-like 2-inch mat, covered in yellow flowers in early summer. Extremely tough and extremely enthusiastic — it self-seeds and spreads aggressively, so use it where you want colonization, not in a tidy rock garden. 6. Sedum makinoi 'Ogon' Small rounded golden leaves on a low creeping mat, unusually tolerant of part shade for a sedum. Excellent in containers and fairy gardens. 7. Sedum ternatum (woodland stonecrop) A North American native and the exception to the sun rule: it grows happily in shade and moister soil, forming 4-inch mats of whorled green leaves with white spring flowers. The sedum for woodland edges. 8. Sedum morganianum (burro's tail, donkey tail) The classic hanging-basket sedum. Long trailing stems, up to three feet, densely packed with plump blue-green overlapping leaves. Leaves detach at the slightest touch, so hang it where nothing brushes past. A houseplant rather than a garden plant in most climates. Browse our hanging plants collection and best trailing plants for companions. 9. Sedum burrito (baby burro's tail) A shorter-leaved, rounder-beaded version of morganianum whose leaves hold on far better. If you have knocked leaves off a burro's tail one too many times, buy this instead. 10. Sedum sieboldii (October daphne) Arching 8-inch stems of round blue-grey leaves edged in pink, arranged in neat trios, ending in dusty pink flower clusters in autumn. Dies back completely in winter and returns in spring. Beautiful cascading from a wall or pot. 11. Sedum nussbaumerianum (coppertone stonecrop) Pointed fleshy leaves in warm apricot-orange to copper, brightest in strong sun, on short branching stems reaching 8 inches. One of the best orange succulents and a favorite in arrangements with echeverias. 12. Sedum adolphii 'Golden Glow' Similar to coppertone but yellower, with red-tinged leaf edges. Fast, easy, and forgiving. Upright Border Sedum Varieties 13. Sedum 'Autumn Joy' (Hylotelephium) The most widely planted perennial sedum in the world. Thick grey-green stems reach 18–24 inches, topped with broad flower heads that open dusty pink in late summer, deepen to rust red, and dry to bronze that stands all winter. A magnet for bees and butterflies. Plant it in lean soil and full sun or the stems flop. 14. Sedum 'Matrona' Similar structure to 'Autumn Joy' but with purple-flushed stems and grey-purple foliage, growing 24–30 inches, with soft pink flowers. Sturdier and less prone to flopping. 15. Sedum 'Purple Emperor' Dark beetroot-purple foliage all season, 15–18 inches tall, topped with dusky pink flowers. The best dark-leaved upright sedum for contrast against silver or chartreuse planting. 16. Sedum 'Autumn Charm' A variegated sport of 'Autumn Joy' with grey-green leaves broadly edged in cream, and pink flowers. Compact at 15 inches. 17. Sedum spectabile 'Brilliant' Bright rose-pink flat flower heads over light green foliage, 18 inches tall. Earlier flowering than 'Autumn Joy' and a stronger pink. 18. Sedum 'Angelina's Teacup' A newer hybrid combining upright form with golden needle foliage — a tidy 10-inch mound that behaves like a border plant but reads like a creeper. Useful in containers. Sedum Comparison Chart Variety Height Foliage Flower Zones Best use 'Blue Spruce' 4–6 in Blue-grey needles Yellow, early summer 3–9 Ground cover, walls, containers 'Angelina' 4 in Golden needles, orange in cold Yellow 3–9 Color contrast, edging 'Dragon's Blood' 4 in Bronze-red rounded Rose-red 3–9 Red ground cover 'Coral Carpet' 2–3 in Tiny green, coral in winter White 3–9 Paving gaps, green roofs Sedum acre 2 in Fine bright green Yellow 3–9 Fast colonizing, gravel Sedum ternatum 4 in Whorled green White, spring 4–8 Shade and woodland Burro's tail Trails 2–3 ft Plump blue-green beads Pink, rare 9–11 / indoors Hanging baskets Sedum sieboldii 8 in Round blue-grey, pink edge Pink, autumn 4–9 Cascading from pots Coppertone 8 in Apricot-copper White 9–11 / indoors Arrangements, color 'Autumn Joy' 18–24 in Grey-green fleshy Pink to rust, late summer 3–9 Borders, pollinators 'Matrona' 24–30 in Grey-purple Soft pink 3–9 Back of border 'Purple Emperor' 15–18 in Deep purple Dusky pink 4–9 Dark foliage contrast How to Grow Sedums — Universal Care Light. Full sun for nearly all varieties. Six hours minimum, more is better. In shade, creeping sedums stretch, lose their color, and become vulnerable to rot; upright varieties flop. The exceptions are Sedum ternatum and 'Ogon', which tolerate part shade. Soil. Lean and sharply drained beats rich and fertile every time. Sedums evolved on rocky outcrops with almost no soil. Heavy clay is the one thing that reliably kills them — amend with grit or plant on a slope or raised bed. In containers, use cactus mix with extra perlite or pumice; see our soil guide. Water. Deeply but rarely. Newly planted sedums need regular water for the first few weeks to establish; after that, most garden sedums survive on rainfall alone. In pots, water when the soil is completely dry — roughly every two to three weeks in summer, far less in winter. Our succulent watering guide gives seasonal rhythms. Fertilizer. Almost never. Rich feeding produces soft, leggy growth and destroys the compact form and coloring you bought the plant for. Pruning. Cut upright varieties to the ground in late winter, just before new shoots appear — leaving the dried flower heads through winter gives structure and feeds birds. For creepers, simply pull back or shear any stems that wander too far; every piece you remove is a cutting. Propagation. The easiest of any plant family. Stem cuttings root in one to three weeks laid on soil. Individual leaves pressed onto damp mix form plantlets. Clumps of upright sedums can be divided in spring. See our succulent propagation guide. Common Problems Problem Cause Fix Mushy, translucent, blackening stems Overwatering or poor drainage Stop watering, improve drainage, take healthy cuttings and restart Stretched, pale, sparse growth Not enough sun Relocate to full sun; cut back and let it regrow compact Upright varieties flopping over Too much shade, water, or fertilizer Cut stems by half in early summer to force sturdier growth Foliage color faded to plain green Insufficient light or too much feeding More sun, no fertilizer — color returns with stress Chewed leaves, slime trails Slugs and snails, especially on upright types Grit or copper barriers; water in the morning, not evening Sudden collapse of a whole patch Crown rot in wet winter soil Replant on a slope or raised bed with grit Frequently Asked Questions Is Sedum reflexum the same as Sedum rupestre? Yes. The names are used interchangeably for 'Blue Spruce' following botanical reclassification. Can sedums grow indoors? Trailing and tender species like burro's tail, coppertone, and 'Golden Glow' make excellent houseplants. Hardy garden creepers can be grown indoors but need a genuinely sunny window. See our sedum care guide for indoor specifics. Are sedums invasive? Not invasive in a legal sense, but Sedum acre and some spreading species colonize enthusiastically. Plant them where spread is welcome. Are sedums safe for pets? Most sedums are considered non-toxic or minimally toxic, though eating any succulent can upset a stomach. Check our pet-safe houseplants guide. Do sedums come back every year? Yes in their hardiness range. Creepers stay evergreen or semi-evergreen; upright types die to the ground and reappear in spring. What grows well with sedums? Anything sharing lean soil and sun: sempervivum, echeveria, crassula, ornamental grasses, and lavender. Where to Start If you want one sedum, make it 'Blue Spruce' for foliage or 'Autumn Joy' for flowers. If you want a planting that fills itself in, combine 'Blue Spruce', 'Angelina', and 'Dragon's Blood' — blue, gold, and red at three slightly different heights, spreading into each other over a single season, and asking for nothing but sun. Explore our succulents collection, string plants, and outdoor plants, or read types of succulents for the wider picture.