Yellow leaves don't mean your plant is dying. They mean something needs attention — but nine times out of ten, that something is a quick fix, not a funeral. Here's how to read what your plant is telling you, in five minutes or less.

Why yellow leaves are usually a thirst signal

Plants tell you they're thirsty before they wilt. Yellowing — especially on the lower leaves first — is often the first visible sign that roots haven't had enough water to do their job. It can also be the first sign of the opposite problem: too much water, drowning the roots so they can't function. Both look similar at first glance. Here's how to tell them apart.

Underwatering: yellow + crispy

Push your finger 2–3cm into the soil. If it comes out dry, with no visible damp residue, you've found the problem. Underwatered plants typically show yellowing on the lower leaves first, often with crispy brown edges or tips. The leaf feels papery between your fingers, not soft.

What to do: Water thoroughly. Take the pot to the sink, run the tap through the compost until water flows freely from the drainage holes, then let it drain for ten minutes before putting it back. Skip the saucer water — never let a plant sit in a puddle. Most plants will recover visibly within 48 hours.

Overwatering: yellow + mushy

If the soil feels wet, sticky, or smells slightly sour, the problem is the opposite. Overwatered plants yellow because their roots are drowning — they need air pockets in the soil to function, and waterlogged compost suffocates them. The leaves often feel soft and limp, sometimes with brown patches that look almost translucent.

What to do: Stop watering immediately. Tip the plant out of its pot if you can, examine the roots — healthy roots are pale and firm; rotted ones are dark and soft. Trim any rotted roots back with clean scissors, repot into fresh, free-draining compost in the same-sized pot, and water sparingly until you see new growth. Most plants recover, but it takes weeks rather than days.

Normal ageing: lower leaves yellowing

Plants drop their oldest leaves to invest in new growth — it's how they work. If only the very bottom leaves are yellowing while new growth at the top looks healthy, that's not a problem. It's the plant doing what plants do.

What to do: Pick off the yellowed leaves once they detach easily. Don't tug or pull — if a leaf doesn't come away with a gentle twist, it's not ready to go yet.

Nutrient deficiency: pale yellow with green veins

If the leaf is pale yellow but the veins remain darker green, the plant is hungry. This is most often an iron or magnesium deficiency, common in container plants that have been in the same pot for a long time without feeding.

What to do: Feed with a balanced liquid fertiliser (any general-purpose plant feed at half strength to start). Repot into fresh compost if the plant has been in the same pot for over two years.

Pests: yellow blotches with sticky residue

If you see yellow blotches or speckled patches, and there's a sticky residue on the leaves or any visible insects (tiny green aphids, fine webbing for spider mites, small white flies), pests are the culprit. Most are easily treated if caught early.

What to do: Wipe leaves gently with a damp cloth to remove most of the pests. For persistent infestations, spray with a horticultural soap or neem oil, focusing on the undersides of leaves. Repeat every 5–7 days until the problem clears.

Frequently asked

Should I pick off yellow leaves?

Only if they're completely yellow and detach easily. A leaf with even some green left is still photosynthesising and contributing to the plant. Forcibly removing partially yellow leaves causes more stress than leaving them alone.

Can a plant recover from lots of yellow leaves?

Yes, in almost all cases. As long as the stem is firm and there's at least some healthy growth left, the plant can rebuild. Diagnose the cause, fix it, and give the plant time. Recovery often takes weeks rather than days, especially after overwatering.

Why are my new leaves yellow?

Yellowing on new growth is almost always a nutrient deficiency or a light problem, not a watering issue. If new leaves emerge pale and small, the plant likely needs feeding (try a half-strength balanced fertiliser) or more light.

What if I've tried everything and the leaves are still yellow?

Drop us a line at support@season28.com with a photo of the plant and a quick description of how you've been caring for it. Our Plant Doctor will get back to you within 24 hours — that's what we're here for.