Best Fertilizer for Houseplants: NPK Ratios and Schedules
Houseplants have different nutritional needs than outdoor plants because they grow in limited soil that gets depleted over time. Most houseplants benefit from a balanced liquid fertilizer diluted to half strength during the active growing season (spring through early fall). Reduce or stop feeding entirely during winter dormancy.
34 Houseplants Fertilizer Guides
Each guide below includes the recommended NPK ratio, application rate, seasonal schedule, and product suggestions for that specific houseplant. Data sourced from university extension services.
Frequently Asked Questions: Houseplants Fertilizer
How often should I fertilize houseplants?
During the active growing season (March through September), fertilize most houseplants every 2 to 4 weeks with a diluted liquid fertilizer at half the label rate. Reduce feeding to once per month in fall, and stop entirely in winter when growth slows. Over-fertilizing houseplants is more common and harmful than under-fertilizing. Signs of over-feeding include brown leaf tips, white salt crust on soil, and wilting despite adequate moisture.
What is the best fertilizer for indoor plants?
A balanced liquid fertilizer with a 10-10-10 or 20-20-20 NPK ratio diluted to half strength works well for most houseplants. Foliage-heavy plants like pothos and monstera prefer a higher nitrogen ratio (3-1-2). Flowering houseplants like African violets and orchids benefit from a bloom formula with more phosphorus (1-3-2). Slow-release granules are a convenient alternative for gardeners who forget to feed regularly.