Plant Care

Indoor Plant Fertilizer Guide: When, What, and How to Feed Your Houseplants You water faithfully. You've found the perfect light. You even picked the right soil. But if you're not fertilizing, your houseplants are running on half a tank. Indoor plants live in a closed system — unlike outdoor plants, they can't send roots deeper or wider to find fresh nutrients. The small amount of soil in a pot gets depleted over time, and without replenishment, growth slows, colors fade, and flowering stops. This guide from Divine Roots Botanicals explains everything you need to know about feeding your indoor plants — what to use, when to use it, and how to avoid the common mistakes that harm more than they help. Why Houseplants Need Fertilizer In nature, decomposing leaves, animal matter, and biological activity continuously enrich the soil. Your living room doesn't have that luxury. The potting mix in your plant's container has a finite supply of nutrients that depletes through two mechanisms: Plant uptake: As your plant grows, it absorbs nitrogen, phosphorus, potassium, and micronutrients from the soil. Leaching: Every time you water, some nutrients dissolve and wash out through the drainage holes. Fresh potting mix typically contains enough nutrients for 6–8 weeks. After that, supplemental feeding makes the difference between a plant that merely survives and one that thrives. Understanding N-P-K: The Big Three Every fertilizer label displays three numbers — like 10-10-10 or 3-1-2. These represent the N-P-K ratio: Nutrient Symbol What It Does Deficiency Signs Nitrogen N Drives leaf growth and green color Pale or yellowing leaves, stunted growth Phosphorus P Supports root development and flowering Dark or purplish leaves, weak roots, no blooms Potassium K Strengthens overall plant health and disease resistance Brown leaf edges, weak stems For most foliage houseplants — pothos, philodendrons, monstera, rubber plants — a balanced fertilizer (equal N-P-K like 10-10-10 or 20-20-20) or a slightly nitrogen-heavy formula (like 3-1-2 ratio) works best because you're primarily growing foliage. For flowering plants (peace lily, orchids, lipstick plant, hoya), choose a formula with higher phosphorus — something like a 10-30-20 bloom booster — during the flowering season to encourage more blooms. Types of Houseplant Fertilizer 1. Liquid Fertilizer (Most Versatile) Liquid fertilizer is diluted in water and applied during your regular watering routine. It's the most popular choice for houseplants because you control the concentration precisely. Pros: Easy to dilute and customize; even nutrient distribution; fast-acting; works for all houseplant types. Cons: Must be applied consistently; easy to over-apply if not diluted properly. How to use: Dilute to half the recommended strength (this is important — manufacturer instructions are often too concentrated for houseplants) and apply every 2–4 weeks during the growing season. 2. Slow-Release Granules Small pellets coated in a temperature-sensitive shell that releases nutrients gradually over 2–6 months. Sprinkle on the soil surface or mix into the top inch. Pros: Set and forget; consistent, even feeding; hard to over-fertilize. Cons: Less control over timing; can be difficult to stop feeding if the plant shows stress; granules may attract fungus gnats if kept too wet. How to use: Apply once at the start of the growing season (spring). Follow package directions for the number of pellets per pot size. 3. Fertilizer Spikes Compressed sticks of fertilizer pushed into the soil near the root zone. They dissolve slowly over 1–2 months. Pros: Convenient; no mixing; deliver nutrients directly to root zone. Cons: Uneven distribution — roots near the spike get concentrated nutrients while roots farther away get little. Can cause localized root burn. How to use: Push 1–2 spikes into moist soil halfway between the stem and pot edge. Replace every 1–2 months. 4. Organic Fertilizers Derived from natural sources like fish emulsion, worm castings, compost tea, seaweed extract, or bone meal. They feed the soil biology as well as the plant. Pros: Gentle and less likely to burn; improve soil structure over time; sustainable. Cons: Some (especially fish emulsion) are smelly; nutrients release slower and are less precise; may attract fungus gnats or other insects. How to use: Worm castings can be mixed into soil during repotting. Liquid organics (fish emulsion, seaweed) are diluted and applied monthly. Fertilizer Type Comparison Type Speed Ease of Use Risk of Burn Best For Liquid Fast (days) Moderate Medium (if undiluted) Most houseplants; regular routine Slow-Release Gradual (months) Easy Low Forgetful plant parents; large collections Spikes Moderate (weeks) Very Easy Medium (localized) Single plants; easy approach Organic Slow (weeks) Moderate Very Low Soil health; eco-conscious growers When to Fertilize (Seasonal Schedule) Houseplants follow a seasonal growth cycle even indoors, driven by changing light levels and day length. Your fertilizing schedule should match this cycle. Spring (March–May): Ramp Up As days lengthen and light increases, plants wake up and start actively growing. Begin fertilizing when you notice new growth — new leaves unfurling, shoots emerging, or the growth rate picking up after winter's slow period. Start with half-strength liquid fertilizer every 4 weeks Or apply slow-release granules once at the start of spring Summer (June–August): Peak Feeding This is the most active growing season for most houseplants. Feed consistently: Liquid fertilizer every 2–4 weeks at half strength Fast-growing plants (pothos, tradescantia, monstera) can handle feeding every 2 weeks Slower growers (snake plant, ZZ plant, fittonia) are fine with monthly feeding Fall (September–November): Taper Off As light decreases and growth slows, reduce feeding: Switch to every 6–8 weeks Reduce concentration to quarter strength Stop completely by late November in most climates Winter (December–February): Stop Most houseplants are dormant or semi-dormant in winter. Fertilizing during this period pushes weak, leggy growth that's susceptible to pests and disease. No fertilizer for most plants Exception: plants under grow lights on long photoperiods may still be actively growing — continue feeding these at half strength monthly How to Fertilize: Step by Step Water first. Never apply fertilizer to dry soil — it concentrates at the roots and causes burn. Water your plant thoroughly, wait 30 minutes, then apply diluted fertilizer. Dilute to half strength. The instructions on most fertilizer bottles are formulated for outdoor or agricultural use. Indoor plants in small pots need half (or even quarter) the recommended concentration. Apply evenly. Pour the diluted fertilizer solution around the entire soil surface, not just at the base of the stem. You want to reach all the roots. Don't get fertilizer on leaves. Some concentrates can burn foliage. Pour at the soil level. Let excess drain. Fertilizer solution should flow out the drainage holes, just like regular watering. Signs of Over-Fertilizing More houseplants are harmed by over-fertilizing than under-fertilizing. The salts in fertilizer build up in the soil and damage roots. Watch for these warning signs: White crust on soil surface — mineral salt buildup Brown leaf tips or edges — salt burn (though this can also indicate watering issues) Wilting despite moist soil — root damage from salt concentration Yellowing or dropping leaves — nutrient toxicity Slowed or stunted growth — ironically, the opposite of what you intended How to Fix Over-Fertilized Soil Flush the soil: Water the plant 4–5 times in succession, letting water run through the drainage holes. This dissolves and removes excess salts. Stop fertilizing for at least 4–6 weeks. If damage is severe, repot into fresh soil and trim any burnt or mushy roots. Signs of Under-Fertilizing Slow growth despite good light and watering Pale or yellowing leaves (especially older leaves — the plant moves nutrients from old growth to new) Smaller-than-normal new leaves No flowering on plants that should bloom Weak, spindly stems If you haven't fertilized in 6+ months and notice these signs, start with a diluted feeding and increase gradually. Don't try to catch up with a concentrated dose — this shocks the plant. Fertilizer Tips by Plant Type Plant Type Best Fertilizer Frequency Notes Tropical foliage (pothos, philodendron, monstera) Balanced liquid (10-10-10 or 20-20-20) Every 2–4 weeks in growing season Dilute to half strength Succulents & cacti Diluted balanced or succulent-specific Monthly in spring/summer Quarter strength; none in winter Flowering plants (peace lily, orchid, hoya) Bloom booster (high phosphorus) Every 2–4 weeks during bloom Switch to balanced formula outside bloom Ferns Diluted balanced liquid Monthly in growing season Very sensitive — use quarter strength Snake plant & ZZ plant Balanced liquid 2–3 times total per year These are very light feeders Carnivorous plants None Never Fertilizer kills most carnivorous plants — they get nutrients from insects Frequently Asked Questions Can I use outdoor garden fertilizer on houseplants? Technically yes, but dilute it to 1/4 the recommended strength. Outdoor fertilizers are formulated for plants in unlimited soil volume — the same concentration in a small pot will burn roots. Is coffee grounds good for houseplants? In small amounts, used coffee grounds can add nitrogen and organic matter to the soil. But they also raise acidity and can attract fungus gnats. If you want to use them, mix a thin layer into the top inch of soil no more than once a month. Most plants do better with proper fertilizer. Should I fertilize a newly repotted plant? No — wait 4–6 weeks after repotting. Fresh potting mix contains nutrients, and the plant's disturbed roots need time to recover before processing fertilizer. Do I need to fertilize if I repot annually? Fresh soil helps, but the nutrients in new potting mix are typically depleted within 6–8 weeks. Even with annual repotting, supplemental feeding during the growing season produces noticeably better growth. The Bottom Line Fertilizing houseplants isn't complicated once you understand the basics: feed during active growth (spring/summer), use half the recommended strength, and stop in winter. When in doubt, less is more — under-fertilized plants look tired; over-fertilized plants look burned. Pair good feeding with the right soil, light, and watering routine, and your plants will reward you with lush, vibrant growth all season long. Browse our best-selling plants for new additions to your collection, or check out our new arrivals for the latest plants ready for your care.

Summer Houseplant Care: 10 Tips to Keep Your Indoor Plants Thriving in the Heat Summer is the season of growth for your houseplants — longer days, stronger light, and warmer temperatures mean your indoor jungle is primed to explode with new leaves, runners, and blooms. But the same heat and intensity that fuels that growth can also cause problems if you're not ready for them. Sunburn, dehydration, pest outbreaks, and heat stress can turn your thriving collection into a struggling one seemingly overnight. Here at Divine Roots Botanicals, we grow plants year-round, and summer is when we see the most dramatic transformations — both good and bad. These 10 tips will keep yours firmly on the "good" side. Why Summer Changes Everything About Plant Care Your houseplants don't care what the calendar says — they respond to light, temperature, and humidity. And all three shift dramatically between spring and summer. Days get longer (up to 15+ hours of light in many regions), temperatures climb, and the angle of sunlight through your windows changes. That window that gave gentle indirect light in February? It might now be blasting direct afternoon sun straight onto your Calathea's leaves. The good news is that most houseplants are actively growing in summer, which means they're resilient, responsive, and ready to reward good care with visible new growth. The key is adjusting your routine to match the season. 1. Water More Frequently — But Don't Overdo It This is the single biggest adjustment you'll make in summer. Higher temperatures and stronger light mean your plants are photosynthesizing more, growing faster, and using water at a much higher rate. Soil that stayed moist for a week in winter might dry out in 2–3 days now. What to do: Check your plants every 2–3 days instead of weekly Use the finger test: push your finger an inch into the soil. If it's dry, water thoroughly until water runs out the drainage hole Water in the morning when possible — this gives plants all day to absorb moisture before the peak heat Don't let water sit in saucers for more than 30 minutes — standing water in hot weather is a recipe for root rot That said, more watering doesn't mean drowning your plants. Succulents and other drought-tolerant plants still need their soil to dry out between waterings — they just dry out faster in summer. The rhythm changes, but the principle stays the same. 2. Protect Your Plants From Sunburn Yes, plants can get sunburned — and it's one of the most common summer problems we see. The sun sits higher in the sky during summer months, which means light angles through your windows change. A spot that received gentle morning light in March might now get blasted with intense midday sun. Signs of sunburn: Bleached, white, or pale patches on leaves Brown, crispy edges or spots (especially on the side facing the window) Leaves curling away from the light source What to do: Move sensitive plants like Fittonia, Calathea, and ferns back from south and west-facing windows Use sheer curtains to filter intense direct light Rotate your plants a quarter-turn each week so all sides get even exposure Damaged leaves won't recover — trim them off to redirect the plant's energy into new growth Sun-loving plants like Echeveria, Sedum, and Lantana will thrive in brighter summer light, but even they can burn if suddenly moved from shade to direct sun without a gradual acclimation period. 3. Boost Humidity for Tropical Plants Here's the summer paradox: it's hot and humid outside, but inside your air-conditioned home it can be bone dry. Air conditioning strips moisture from the air, creating a desert-like environment that tropical plants hate. If you notice your Calathea's leaves curling, your fern's fronds going crispy, or your Fittonia wilting dramatically, low humidity is likely the culprit. How to increase humidity: Group your plants together — plants naturally release moisture through transpiration. A cluster of plants creates a humid microclimate around them Use a pebble tray — set pots on a tray filled with pebbles and water (the pot should sit on the pebbles, not in the water). As the water evaporates, it humidifies the air around the plant Run a humidifier — the most effective option for large collections. Aim for 50–60% humidity for most tropicals Mist strategically — a morning mist can help, but it's a temporary fix. Focus on the methods above for lasting results Keep plants away from AC vents — the cold, dry air blowing directly on leaves causes rapid moisture loss 4. Feed Your Growing Plants Summer is peak growing season, and growing plants are hungry plants. Unlike winter, when most houseplants are dormant or semi-dormant, summer is when your plants can actually use the nutrients you give them. Fertilizing guidelines for summer: Use a balanced liquid fertilizer (like a 10-10-10 or 20-20-20) diluted to half strength Feed every 2–4 weeks during the growing season (roughly May through September) Always water the soil before fertilizing — never apply fertilizer to dry soil, as it can burn the roots Succulents and cacti: use a diluted cactus-specific fertilizer once a month. Less is more Skip fertilizer for any plant that's stressed, recently repotted, or showing signs of illness — it needs to recover first, not be pushed to grow Signs of over-fertilizing include white crusty buildup on the soil surface, brown leaf tips, and wilting despite moist soil. If you see these, flush the soil with plain water several times and skip fertilizer for a month. 5. Summer Is Prime Time for Repotting If you've been putting off repotting, summer is the ideal time. Plants are actively growing and can recover from the disruption much faster than they would in fall or winter. Signs your plant needs repotting: Roots growing out of the drainage holes Water running straight through the pot without being absorbed The plant is top-heavy and tips over easily Growth has stalled despite good light and consistent watering The root ball is a dense, circling mass when you slide the plant out of the pot For a detailed walkthrough of the process, check out our complete repotting guide. The general rule: go up one pot size (1–2 inches wider in diameter) and use fresh, appropriate potting mix. 6. Propagate While the Growing Is Good Summer's warm temperatures and strong light create ideal conditions for propagation. Cuttings root faster, divisions recover quicker, and your success rate is dramatically higher than trying in the dead of winter. Easy summer propagation projects: Pothos — snip below a node, place in water, roots appear in 1–2 weeks Tradescantia — one of the fastest-rooting plants; cuttings root in days Philodendron — stem cuttings in water or directly in soil Spider Plant — those dangling "babies" (spiderettes) can be snipped and potted Succulents — leaf propagation is slow but deeply satisfying. Summer warmth speeds the process significantly Angel Wing Begonia — stem cuttings root readily in water during summer. With over a dozen varieties in our collection, you can build quite the Begonia family 7. Watch for Summer Pest Outbreaks Warm, dry indoor conditions are a pest paradise. Summer is peak season for the most common houseplant invaders, and an infestation can spread fast through a closely grouped plant collection. The usual suspects: Spider mites — tiny red or brown dots on the undersides of leaves, fine webbing between stems. Thrive in hot, dry air (hello, air conditioning). Mist leaves regularly and wipe them down to prevent infestations. Fungus gnats — tiny black flies hovering around soil. Let the top inch of soil dry out between waterings. A layer of sand on top of the soil deters egg-laying. Mealybugs — white, cottony clusters on stems and leaf joints. Wipe off with rubbing alcohol on a cotton swab. Thrips — tiny, slender insects that leave silvery streaks on leaves. Treat with neem oil or insecticidal soap. For a complete identification guide, check our article on houseplant pest identification and treatment. Prevention is key: Inspect your plants weekly during summer. Check the undersides of leaves, leaf joints, and the soil surface. Catching pests early — when there are only a few — is infinitely easier than dealing with a full infestation. 8. Know When (and How) to Move Plants Outdoors Many houseplants love spending summer outdoors — the increased airflow, natural light, and humidity can supercharge their growth. But the transition needs to be gradual, or you'll shock your plants. How to transition plants outdoors safely: Wait until nighttime temperatures are consistently above 55°F (13°C) — most tropical houseplants can't handle cold nights Start in full shade for the first week, even if the plant normally loves bright light. Indoor plants haven't built up UV tolerance Gradually increase sun exposure over 2 weeks Place plants in a sheltered spot — protected from strong wind and heavy rain Check for pests more frequently — outdoor plants are exposed to insects they never encounter inside Best candidates for outdoor summer vacations: Lantana (naturally an outdoor bloomer), succulents, Coleus, and Tradescantia. Plants to keep inside: Fittonia, Calathea, and most ferns prefer the controlled indoor environment year-round. 9. Plan for Vacations Summer means travel — and leaving your plants unattended for a week or two can be stressful (for you and them). Here's how to vacation-proof your indoor garden: For trips up to 1 week: Water all plants thoroughly the day before you leave Move plants away from direct sunlight to slow evaporation Group plants together to create a humid microclimate Succulents and drought-tolerant plants will be fine — they barely notice a week without water For trips of 1–2 weeks: Use self-watering spikes or globes — inexpensive and effective Set thirsty plants on a capillary mat (a damp towel) in a bathtub or sink, where they can wick up water as needed Fill a large container with water and run cotton wicks from the water into each pot — DIY drip irrigation Ask a plant-loving friend or neighbor (bribery with plant cuttings works well) For longer absences: Consider moving your most sensitive plants to a friend's house. Hardy plants like Pothos, Spider Plants, and Chinese Evergreen can handle a couple of weeks of neglect, especially in lower-light spots where they use less water. 10. Watch for Signs of Heat Stress Even indoors, extreme heat can stress your plants — especially during heat waves when indoor temperatures climb above 85°F (29°C), or when plants sit too close to sun-baked windows. Signs of heat stress: Wilting or drooping despite moist soil (the plant is losing water through its leaves faster than roots can absorb it) Leaf edges turning brown and crispy Sudden leaf drop Flowers wilting or dropping prematurely Soil drying out within 24 hours of watering How to help a heat-stressed plant: Move it away from windows during the hottest part of the day (typically 12–4 PM) Increase humidity around the plant with misting or a pebble tray Water more frequently, but ensure good drainage Don't fertilize a heat-stressed plant — it needs rest, not a growth push Run a fan on low to improve air circulation (stagnant hot air is worse than moving hot air) Your Summer Plant Care Calendar Here's a quick reference to keep your plant care on track all summer long: Weekly: Check soil moisture on all plants. Inspect for pests. Rotate pots a quarter-turn. Wipe dust off large leaves Bi-weekly: Fertilize actively growing plants at half-strength Monthly: Check if any plants need repotting. Prune leggy growth. Clean drainage saucers As needed: Propagate cuttings from pruning. Adjust plant positions as sun angles change through the season Summer-Ready Plants from Divine Roots Whether you're building out your collection for summer or looking for heat-tolerant, easy-care additions, these collections are a great starting point: 🌿 Shop Our Best Sellers — The most popular plants in our greenhouse right now 🌿 Beauty Without the Fuss — Low-maintenance picks that handle summer like pros 🌵 Succulent Collection — Sun-loving, drought-tolerant summer stars 🌸 Lantana Collection — Colorful bloomers that thrive in summer heat 🐾 Pet-Friendly Plants — Safe choices for homes with curious summer pets 🌑 Low-Light Plants — Perfect for rooms where you've pulled plants back from bright windows Frequently Asked Questions Should I water my houseplants more in summer? Yes. Higher temperatures, stronger light, and active growth all increase your plants' water needs. Most houseplants will need watering roughly twice as often in summer as in winter. Check the soil every 2–3 days and water when the top inch feels dry. Always water deeply until it runs from the drainage hole, rather than giving small, frequent sips. Can houseplants get too hot indoors? Absolutely. Most tropical houseplants prefer temperatures between 65–85°F (18–29°C). When indoor temperatures climb above 90°F (32°C) — especially near windows in direct sun — plants can experience heat stress, wilting, and leaf damage. Move sensitive plants away from hot windows and use fans for air circulation during heat waves. Is it safe to put houseplants outside in summer? Many houseplants benefit from spending summer outdoors, but the transition must be gradual. Start in full shade for a week, then slowly increase light exposure. Wait until nighttime temperatures stay above 55°F (13°C). Keep outdoor plants in sheltered spots away from harsh wind and inspect them regularly for pests before bringing them back inside in fall. Why are my plant's leaves turning brown at the tips in summer? Brown leaf tips in summer are usually caused by one of three things: low humidity (especially from air conditioning), underwatering, or salt buildup from fertilizer. Increase humidity around the plant, make sure you're watering deeply when you do water, and flush the soil with plain water monthly to wash out accumulated salts. For a deeper dive, check our leaf troubleshooting guide. When is the best time to repot houseplants in summer? Early summer (May–June) is ideal. The plant has the entire growing season ahead to recover and establish roots in its new pot. Avoid repotting during heat waves or when the plant is already stressed. Water thoroughly after repotting and keep the plant out of direct sun for a week while it settles in. Our step-by-step repotting guide walks you through the full process. How do I keep my plants alive while on vacation? For trips up to a week, water deeply before leaving and move plants away from direct sun. For 1–2 week trips, use self-watering spikes, a capillary mat setup, or DIY cotton-wick watering. Move plants to lower-light spots to reduce water consumption. Hardy plants like Pothos, Spider Plants, and succulents handle short absences well on their own.