Plant nutrient deficiencies: recognise signs and check the cause

Pale leaves, slower growth or damaged edges are not enough to diagnose a deficiency. Check growing conditions before changing fertiliser.

This guide is exclusively about plants

Fertiliser feeds a plant, not a person. Tropica Specialised Nutrition is a fertiliser for aquarium plants; it is never a human dietary supplement. Keep products in their packaging and follow their labels.

Observe before adding a product

1. Note which leaves are affected: old or new, one leaf or the whole plant.
2. Check substrate moisture and drainage; inspect the roots if the pot stays saturated.
3. Inspect the undersides of leaves and the petioles for possible pests.
4. Review previous feeding: repotting date, fertiliser already in the mix, dilution and frequency.
5. Check available light and the plant’s development rather than inferring a deficiency from colour alone.

Signs that may fit, but are not specific

A photo alone cannot reliably identify a missing nutrient. If symptoms persist, ask a horticultural professional to confirm the cause; substrate or water analysis may be needed.

Address one cause at a time

First restore suitable watering and functional roots. Then choose a product explicitly intended for your plants and follow the manufacturer’s dosage. Do not combine several fertilisers to speed up recovery. Observe new growth; a leaf that is already damaged is not a reliable indicator of recovery.

For a potted plant, see fertilisers for indoor plants and the guide to choosing fertiliser for foliage plants. For an aquarium, use only a product suitable for that environment and follow its instructions.

Editorial review: 3 October 2026 · TerraLED. Set up your equipment according to its instructions and the needs of the species.