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Houseplants bring colour, freshness, and style into the home, but even the healthiest indoor plants need the right nutrients to thrive.
In this guide, we’ll explain when to feed indoor plants, the best plant food for houseplants, and practical houseplant fertiliser tips to help your indoor garden flourish all year round.
Unlike outdoor plants, houseplants rely entirely on the nutrients available in their pots. While fresh compost contains enough food for the first few weeks, nutrients are quickly used up or washed away during watering.
Without regular feeding, indoor plants can become:
Most potting compost provides nutrients for around six weeks. After this, supplementary feeding becomes essential to maintain healthy growth.
👉 Expert Tip: Yellowing leaves are often one of the first signs your plant needs feeding, especially during spring and summer growth periods.
When learning how to fertilise indoor plants, it helps to understand the three key nutrients found in fertilisers:
Encourages lush green foliage and healthy leaf growth.
Supports strong roots and vigorous shoots.
Promotes flowers, fruit production, and overall plant resilience.
This combination is known as the NPK ratio, displayed on fertiliser packaging.
| Fertiliser Type | Purpose |
|---|---|
| Balanced feed | Suitable for most houseplants |
| High nitrogen feed | Best for leafy foliage plants |
| High potassium feed | Ideal for flowering plants |
A balanced fertiliser works well for most indoor plants, while specialist feeds can improve results for orchids, citrus plants, succulents, and flowering varieties.
👉 Pro Tip: Always dilute fertiliser exactly as instructed. Overfeeding is one of the most common causes of damaged houseplants.
Choosing the best plant food for houseplants depends on the type of plants you grow indoors.
Plants such as philodendrons, palms, monsteras, and tradescantia benefit from nitrogen-rich feeds that encourage leafy growth.
Feed every two weeks during spring and summer.
Flowering indoor plants need extra potassium to support blooms. Tomato fertiliser diluted to half strength works exceptionally well for many flowering houseplants.
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Orchids are sensitive to overfeeding and require specialist orchid fertiliser or a diluted houseplant feed.
These low-maintenance plants need minimal feeding but will produce stronger growth and flowers with occasional fertiliser in spring and summer.
Indoor citrus trees are hungry plants and benefit from regular feeding every two weeks during active growth.
Most indoor plants actively grow from spring through to early autumn.
Plants growing under warm indoor conditions with artificial lighting may continue slow winter growth and benefit from occasional feeding.
Knowing how to fertilise indoor plants properly can prevent root damage and maximise nutrient absorption.
Liquid feeds are the easiest option for most houseplants because they combine easily with regular watering routines.
Slow-release pellets and drip feeders can also be useful for busy households or when travelling.
👉 Expert Tip: Rotate your houseplants every few weeks while feeding to encourage even growth and balanced foliage.
Plants such as African violets and azaleas may benefit from ericaceous fertiliser designed for acidic soil conditions.
Too much fertiliser can scorch roots and damage leaves. Always dilute feeds as instructed, as stronger solutions can do more harm than good.
Most plants need little or no feed during winter when growth slows down.
Different plants have different nutritional needs, so choose a fertiliser suited to your plant.
Always water plants first before applying liquid feed to avoid root burn and help nutrients absorb properly.
Feeding is only one part of successful houseplant care. Combine feeding with these simple practices for the best results:
Healthy plants absorb nutrients more effectively and grow more vigorously.
Choosing the right feed helps houseplants maintain healthy growth, strong foliage and, for flowering varieties, a good display of blooms. At our Garden Centre in Kington, we stock a range of houseplant fertilisers, including specialist orchid and citrus feeds for plants with more specific requirements.
You’ll also find healthy indoor plants, decorative pots, watering equipment and practical plant care products, with friendly advice available if you need help choosing the right products.
Visit us in Kington today and discover everything you need to keep your houseplants healthy, vibrant, and flourishing throughout the year.
