Do Indoor Plants Need Fertiliser? Yes — Here’s Why

If your indoor plants look tired, pale, or stuck in place, chances are they’re hungry. Here’s why feeding matters—and how to do it right with CompleteGrow.

Just because your plants live indoors doesn’t mean they can survive on sunlight and water alone. Unlike outdoor soil, potting mix runs out of nutrients over time. That’s why regular fertilising is key to keeping your houseplants healthy and growing strong.

Why Indoor Plants Need Fertiliser

In nature, plants recycle nutrients through rain, worms, and decaying organic matter. In a pot? None of that happens. Once your plant uses up the nutrients in the soil, it needs help to keep growing.

Without feeding, you’ll see:

• ☁️ Pale or yellowing leaves
• 📉 Slow or stunted growth
• 🍂 Leaf drop, especially on older leaves

These are signs that your plant is running low on essentials like nitrogen, potassium, and magnesium.

What Fertiliser Should You Use?

CompleteGrow Indoor Plant Food Concentrate is specially designed for indoor conditions. It feeds your plant without harsh salts, heavy odours, or messy residue—making it perfect for living rooms, bedrooms, and workspaces.

Key benefits:

• 🪴 Makes up to 500L from a 500ml bottle
• 🌿 Supports healthy leaf growth and root development
• 💧 Gentle, clean, and easy to mix with water

For larger indoor food crops or flowering balcony plants, you can also use our All-Purpose Liquid Fertiliser (NPK 20-20-20) at half strength.

How Often Should You Feed Indoor Plants?

Most indoor plants do best when fed:

• 🗓️ Every 2–4 weeks during spring and summer
• 🌱 Monthly during autumn
• 🌙 Not at all (or every 6–8 weeks) during winter dormancy

Always dilute as directed and avoid fertilising when the plant is stressed or dry—this can do more harm than good.

What Plants Benefit Most?

Our Indoor Plant Food is ideal for:

• 🪴 Fiddle leaf figs, monsteras, pothos, peace lilies
• 🌵 Snake plants, ZZ plants, and succulents (at low strength)
• 🌿 Basil, mint, and other herbs grown indoors

Even slow growers benefit from small, consistent doses to maintain strong leaves and healthy roots.

Feed, Don’t Forget

Think of fertiliser like vitamins for your plants—it’s not a quick fix, but it’s essential for long-term health. With the right nutrition, your indoor plants will thrive, not just survive.

Ready to give your houseplants what they need?
Shop CompleteGrow Indoor Plant Food →