How to Prevent and Fix Leggy Seedlings

After seeds germinate, do your leggy seedlings look weak and straggly like this?

 

Leggy seedling stems are long and thin, but there are few or very tiny leaves.

Leggy seedling stems are long and thin, but there are few or very tiny leaves.

What Causes Leggy Seedlings?

‘Leggy’ seedlings typically have stretched skinny stems and look fragile. They may be bending forward rather than growing up straight with a strong stem.

If your newly germinated seedlings look like this, it may be due to one of three common causes:

  1. Insufficient Light. This is the usual reason why leggy, tall thin seedlings develop. Young seedlings can struggle to access adequate light (from the sun, an indirect source or a heat lamp).

 

If seedlings are in too much shade or a spot lacking sufficient natural or artificial light, they can grow tall too fast, trying to seek it out.

If seedlings are in too much shade or a spot lacking sufficient natural or artificial light, they can grow tall too fast, trying to seek it out.

 

  1. Lack of Soil Moisture. Baby plants can grow weak, skinny stems if the seed raising mix dries out. Maybe you just forgot to water often enough! Dry soil stops the seedlings from accessing the nutrients they need to grow strong stems and leaves. They’re literally starving, poor little darlings.

 

  1. High Temperatures. Heat can also cause a rapid growth spurt. This causes the stems to grow faster than the leaves. So the seedling has unbalanced growth. They look like they’re ‘all legs with a tiny head’! This can occur in hot weather or indoors if the temperature is too warm.

 

 “Mistakes are tools for learning. Evaluate your trials. Making mistakes is a sign you’re trying to do things better. There is usually little penalty for mistakes if you learn from them.” – Toby Hemenway, Author Gaia’s Garden

 

4 Factors to Consider with Leggy Seedlings

Should you abandon your babies and start raising seeds again? Or can they be rescued and grow into healthy adult plants? That depends!

  • Are these seeds the only ones you have? If so, they’re probably precious and are worth putting a little effort into saving.
  • Do you have plenty of seeds? If these ones only germinated in the last week or so, maybe you can just start again. You really haven’t lost much.
Time your seed sowing to increase germination rates and promote healthy strong seedlings. I use a moon gardening calendar to help me know the best planting times so I swing things in my favour!

Time your seed sowing to increase germination rates and promote healthy strong seedlings. I use a moon gardening calendar to help me know the best planting times so I swing things in my favour!

 

  • What cycle of the moon is it now? You may be able to use it to your advantage. If it’s an optimum time for seed raising within the next few days, starting again may be a good idea. Even as a backup plan! You will likely end up with stronger seedlings that germinate fast and may well overtake these ones in growth anyway.
  • Are you sowing late in the season? This determines how much time you have to play with. If you don’t raise these babies now and get them into the soil, will you miss the window for planting?

 

“Keep on sowing your seed, for you never know which will grow – perhaps it all will.” – Albert Einstein

 

How to Fix Leggy Seedlings

If you’ve decided you want to nurture your seedlings back to good health, the solutions are quite simple.

If lack of light is the issue, this is easy to fix!

If lack of light is the issue, this is easy to fix!

 

1. Light. Are your plant babies leaning toward a window or light source? If so, turn them around daily so they grow up straight instead of bent. Ideally, move them to a more suitable spot where the light is stronger. e.g. Close to a window indoors, in a greenhouse or protected outdoor location.

 

2. Dry soil. This may be obvious, but you could try watering more consistently!

  • Wicking tray. One way to water your seedlings is to add a small amount of water to a shallow tray or container. Sit your pot or seed raiser inside the tray. Allow the soil to ‘drink’ up as much moisture as needed. Not too much though. You don’t want your seeds to rot!
  • Set a reminder on your mobile for a daily seedling checkup.
  • Keep a spray bottle handy beside your seedlings. This may also prompt you to water regularly.

 

Mist with a fine spray to keep the soil moist.

Mist with a fine spray to keep the soil moist.

 

3. Too hot. Move your babies to a cooler spot or provide shade protection with filtered light. Ensure they have adequate moisture if the weather is warm.

4. Transplant. If your seedlings are mature enough for transplanting, this may also solve the problem. Gently move your seedlings to a protected area to sun harden them for a few days. This will encourage them to strengthen and get ready to ‘move house’ into the big wide world of your garden!

 

Leggy Seedlings Solution: If your tomato seedlings have long leggy stems, one solution is to plant them deep.

If your tomato seedlings have long leggy stems, one solution is to plant them deep.

 

Bury at least two thirds of the stem under the soil.  This encourages the seedling to grow new roots along the buried length of the stem. The tiny fine hairs are actually baby rootlets. This won’t usually work for plants in most other plant families, because the stems may rot when buried too deep.

 

How to Keep Seedlings from Getting Leggy

 

What steps can you take to avoid leggy seedlings?

  • Next time you sow seeds, choose a sunny position with good light and ventilation. Then your babies can grow without frying in the heat or straining for sunlight. A mini greenhouse may help control temperature and light.

 

Seeds germinating into healthy seedlings in punnets with good light and moisture

Seeds germinating into healthy seedlings in punnets with good light and moisture

  • Be observant daily. Don’t wait until a problem occurs. Prevent it earlier. Diagnose any issues before they become too difficult to resolve.
  • Time your seed sowing to work in with the moon cycle. This not only encourages earlier seed germination but plants grow stronger from the start. When they are transplanted into your garden, they are more likely to be resilient to pests and diseases too. A healthy, strong seedling will give you the best chance of success.
  • Out in your garden, self-sown seedlings are naturally blown about by the wind. This helps them develop stronger, thicker stems from ‘birth’. If you’re raising seed ‘babies’ indoors or in a protected environment, use a fan to blow air over your seedlings daily or run your hand over them gently several times. This gentle movement imitates nature. Cool hey? Nature knows best!

 

Hope these tips help you raise lots of healthy plant ‘kids’ in your garden! If you enjoyed this article, please remember to share.

 

© Copyright Anne Gibson, The Micro Gardener 2010-2016 – https://themicrogardener.com. All rights reserved.

One Comment

  1. adie January 28, 2017 at 1:46 am - Reply

    i love this site

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