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# Leggy, weak seedlings

Leggy seedlings are tall, pale and thin, with a long bare stem and a big gap between the seed leaves and the compost. They are stretching towards the light. It is the most common thing to go wrong indoors, and usually fixable.

## How to recognise it

| Sign | What it looks like |
| ---- | ---- |
| Tall and thin | long, weak stems |
| Pale | light green or yellowish |
| Floppy | leaning or falling over |
| Big gaps | stretched between the leaves |

## What causes it

- **Too little light.** By far the main cause. On a dim windowsill seedlings stretch towards the nearest light.
- **Too much warmth.** Heat without matching bright light pushes fast, soft, weak growth.
- **Overcrowding.** Seedlings packed together shade each other and race upward.
- **Sown too early.** Sowing weeks before there is enough natural light means a long, leggy wait indoors.
- **Light from one side only.** Without turning, seedlings lean and stretch towards the single window.

## How to rescue them

Act early and they can usually be saved.

- Move them to the brightest spot you have, or add a grow light a few centimetres above them.
- Lower the temperature a little. Cooler and brighter grows stockier plants.
- Add airflow with a gentle fan. Moving air thickens and strengthens stems.
- Thin or space crowded seedlings so each gets full light.
- With tomatoes you can pot on deeper: bury the long stem up to the seed leaves and it will root along its length.

## Can they still come good?

Often, yes, especially if you catch it early. Tomatoes recover well precisely because you can bury the stem. Most others — herbs and brassicas, for instance — cannot be buried deeper, so improve their light and airflow straight away and they usually firm up. Badly stretched, floppy seedlings are often quicker to re-sow. With fast crops you lose very little time.

## Preventing it next time

| What | How |
| ---- | ---- |
| Bright light | from day one |
| Cooler nights | do not keep them too warm |
| Sow on time | not too early |
| Sow thinly | room to grow |
| Turn daily | even light |
| Airflow | strong stems |

The fix is almost always more light and less heat.

## Frequently asked questions

**Will leggy seedlings still grow?** Many will, but they are weaker and more prone to flopping or disease. It is worth fixing the cause now.

**Can I plant them deeper?** With tomatoes yes, with most others no — improve their light and airflow instead.

**Do I need a grow light?** Not always, but on a dark windowsill a simple grow light makes a big difference.

**Why are mine leggy on a sunny windowsill?** Light from one side combined with indoor warmth. Turn them daily, cool them down and add airflow.

The full version of this guide is on [seedschoice.com](https://seedschoice.com/blogs/news/leggy-seedlings-causes-and-fixes).
## Starting again? These seeds are easy
* [Fast-growing vegetables](https://seedschoice.com/collections/fast-growing-vegetables) — quick results, ideal for beginners
* [Microgreens and sprouts](https://seedschoice.com/collections/microgreens-sprouts) — ready to harvest indoors in days
* [Vegetables you can sow this month](https://seedschoice.com/collections/vegetables-sow-now)
* [All vegetable seeds A–Z](https://seedschoice.com/collections/vegetables)
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