Why Are My Seedlings Wilting After Transplanting Into a Tower Garden?

1. The Seedlings Didn't Get Enough Light Before Transplanting

This is most common with seedlings you've started yourself, but it can also happen to purchased seedlings if they're kept in low light for too long before planting.

Seeds don't need light to germinate, but as soon as the sprout emerges from the seed, it needs adequate light to develop into a strong seedling. Not enough light immediately following germination can produce weak, stretched seedlings that simply aren't as prepared for transplanting.

If you're starting your own seedlings, ideally start them in the same type of environment where they'll eventually be growing: outdoor seedlings started outdoors and indoor seedlings started indoors under appropriate grow lights.

A seedling that has spent its early life indoors in relatively low light can struggle if it's suddenly moved outside into bright sun and heat. Even if it looked fine indoors, that abrupt change can cause significant wilting.

The difference good light makes: Weak seedlings stretch toward the light, while seedlings receiving adequate light develop stronger, more compact growth.

Want to grow strong seedlings from the start? Our Perfect Seedling Guide walks you through the whole process, from germination through getting seedlings ready to transplant.

What about seedlings that were shipped?

Our seedlings are grown outdoors, so they're already accustomed to outdoor light and temperatures before they're shipped.

But once they're delivered, they need good light after you receive them and while they're waiting to be planted.

If they're left inside for several days after delivery—or sitting near a window where the light looks bright to us but isn't strong enough for the plants—they can begin to weaken.

If you can't plant your seedlings right away, remove them from the shipping trays, make sure the rockwool stays moist, and keep them in a partially shady area while they're waiting to be planted. They still need good light, but you don't want freshly shipped seedlings sitting in intense sun and heat before they're transplanted.

Learn more about indoor and outdoor lighting in our Tower Garden Light Guide.

2. You're Using Unfiltered City Water

This is one of the first things we ask when a customer tells us that multiple healthy seedlings suddenly wilted after being planted.

We've seen this happen more times than we can count.

Municipal water may contain chlorine or chloramine, and young seedlings can be particularly sensitive. Here in the Florida Keys, chloramine is an especially important consideration.

If several seedlings begin wilting soon after they're placed in a freshly filled Tower, check the water source early in your troubleshooting.

“But I've used this water for years and never had a problem.”

We hear this one a lot too—and it doesn't necessarily mean your water isn't the problem.

There are a few reasons things may be different this time.

If you've previously started your own seedlings using the same water, those plants have been exposed to it from the beginning. Purchased seedlings may have been grown with a completely different water source.

At Living Towers, we filter our city water because our municipality uses chloramine, and we've seen the effects it can have on young plants—especially during the hot weather we experience for much of the year.

Municipal water treatment can also change. Water utilities sometimes perform temporary system flushing or disinfection, using higher disinfectant levels or temporarily changing the type of disinfectant being used. So the water coming from your faucet today isn't necessarily identical to what you've been using for the past several years.

And there's an important difference between chlorine and chloramine. Chlorine dissipates relatively readily when water is allowed to sit. Chloramine is much more persistent, so simply filling the reservoir and letting the water stand isn't an effective way to remove it.

That's why we don't rule out water quality just because “I've always used this water.” If several previously healthy seedlings suddenly wilt after being placed in the same reservoir, the water is still one of the first things we'd investigate.

Read our Tower Garden Water Guide for help choosing a suitable water source, or learn the difference between chlorine and chloramine .

3. The Nutrient Solution Is Too Strong

New seedlings don't need full-strength nutrients immediately.

That's half the normal strength used for established plants.

Using full-strength nutrients on day one doesn't always result in immediate wilting. But it can increase stress, particularly when combined with another issue such as unfiltered city water or summer heat.

The nutrient concentration can also become stronger over time as plants use water and water evaporates from the reservoir. This becomes particularly important during hot weather.

More nutrients aren't better. Give young seedlings a chance to establish first.

See our complete Tower Garden Nutrient Guide for mixing and replenishing instructions.

4. You're Using Sodium-Softened Water

This is different from filtering your water.

Many household water softeners work by exchanging minerals in the water for sodium. That may be fine for household use, but sodium can create problems for plants.

If your outdoor faucet bypasses the water softener, use that source instead and filter it appropriately if you're on municipal water.

If you're not sure whether the water you're using passes through your softener, it's worth finding out.

Our Tower Garden Water Guide covers softened, city, well and filtered water in more detail.

5. The Seedlings Were Moved From Indoors Straight Into Outdoor Heat

This one applies particularly to seedlings you've started yourself.

A seedling grown indoors isn't automatically prepared for life outside.

If you've raised seedlings indoors and then transplant them directly into an outdoor Tower on a hot, sunny day, they may wilt very quickly.

Whenever possible, start seedlings in the environment where you plan to grow them. If they'll be growing outside, start them outside. If they'll be growing indoors, start them indoors under suitable grow lights.

If indoor-started seedlings do need to move outside, they'll need a more gradual transition rather than going straight from protected indoor conditions into intense sun and heat.

6. Shipped Seedlings Were Transplanted During the Hottest Part of the Day

Just arrived in the mail? Don't make their first afternoon home the hardest one yet.

They've already spent a couple of days traveling in a dark box.

In summer, when temperatures are over about 80°F, avoid transplanting shipped seedlings during the hottest part of the day. Plant around dawn or dusk instead so they have time to settle into the Tower before facing the strongest sun and heat.

And don't leave the shipping box sitting around until then. Open it when it arrives, remove the seedlings from their shipping trays, make sure the rockwool is moist, and keep them in a partially shady area while they're waiting to be planted.

7. It's Simply Too Hot for What You're Growing

There's a difference between transplanting during the hottest part of the day and trying to grow a crop that simply doesn't like the current temperature.

Cool-season crops can struggle when temperatures climb, particularly young seedlings that haven't established yet.

If one type of crop is wilting while your heat-loving plants look perfectly happy, the crop itself may be giving you the clue.

Before assuming there's something wrong with the Tower or the seedlings, consider whether what you're growing is actually suited to your current weather.

8. Overnight Temperatures Are Too Cold

The opposite can happen too.

Overnight temperatures approaching freezing can cause wilting and damage, particularly to young, delicate seedlings.

Frost can cause much more severe damage or kill young seedlings altogether.

Pay attention to the overnight low, not just how warm it was when you planted them during the day. A beautiful 60°F afternoon doesn't help a tender seedling very much if temperatures plunge overnight.

9. Heavy Rain Has Beaten Down the Seedlings

Tower Gardens are perfectly happy outside in the rain. Newly transplanted seedlings, however, are small and delicate.

A heavy downpour can physically beat young seedlings down before they've had time to establish.

If heavy rain is expected immediately after planting, giving very young seedlings some temporary protection can help. Once they've grown larger and stronger, normal rain is much less of a concern.

10. Strong Wind Is Whipping the Seedlings Around

The same principle applies to wind.

Young seedlings don't yet have the stronger stems and established root systems they'll develop as they grow. Winds over about 20 mph can whip newly transplanted seedlings around and leave them looking pretty miserable.

If strong winds are expected right after transplanting, temporarily moving or protecting the Tower can give young plants a chance to establish.

You don't need to permanently shelter your Tower from every breeze. We're talking about protecting very young seedlings from unusually strong wind while they're getting established.