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I've been growing cucumber plants from seed this year and everything was going fine until I started trying to move them outside when they were about 8 inches tall. I was acclimating them to the outdoor conditions along with my tomato and pepper plants by placing them outside for a few hours each day, but I always found that the cucumbers wilted by such a large degree when they were outside that I got scared and moved them back indoors after an hour or so. The other plants were fine.

I ended up moving the cucumber plants straight into the greenhouse a few weeks ago, and since then they've gradually got worse and worse, with the leaves becoming very floppy and wilted, followed by the young fruit wilting, and now the entire stems are buckling and collapsing to the soil level. Meanwhile, I kept two plants indoors that were, up until that point, treated identically to the outside plants, and they're thriving (or, at least, not dying).

I'm fairly certain that they have had sufficient water, and the temperature hasn't dropped below about 5°C here since they've been outside, however I forgot to poke holes in the bottom of the plants' growbag, so they spent the first couple of weeks with no drainage. At no point did the soil appear to be saturated, though, and I've since cut some drainage holes about a week ago, but the plants have only got worse.

Does anyone have any idea what I've done wrong? I'm really quite baffled at this stage...

For reference, the seeds I sowed were shop-bought Cucumber Amanda F1 seeds, and I've included photos of both the wilting and healthy plants below.

I am in the UK.

Image of wilting plants:

Image of healthy plant:

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Just a note: My cukes I sowed outdoors took longer to sprout, but I think they will do better in the long run. When I transplant cukes I take out the whole root ball and I'm very careful not to let the dirt come apart. I put the whole pot-sized blob of dirt right in a perfect sized hole. – Bulrush Jun 7 at 13:06
up vote 7 down vote accepted

You hear often that squash/cucumbers/melons/pumpkins don't like to be transplanted, for several reasons, one of which is that they are very delicate, in that they are very soft and vascular, if any of the vascular tissue gets pinched or stretched or broken, it can lead to dessication. Good luck, plenty of summer left if you want to direct sow...

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Thanks; I've ripped up the dead plants (and discovered their really poor root system, which used to be much better; one of them didn't even have roots, as such - just a couple of inches of "underground stem") and sown some seeds straight in the greenhouse soil. Hopefully I'll have better luck this time! – Aziraphale May 12 '12 at 21:50
    
@Aziraphale Cucumbers that have had it too easy when they're small don't develop a root system. You need to encourage them to root deeply and broadly so they have a large reservoir to pull water from on hot days. They're darn thirsty plants. I have volunteers that grow from seeds in the compost that get established in my pepper tubs. They're good water saturation indicators that way, they wilt before the peppers wilt, so on a hot day, more water... More peppers. – Fiasco Labs Aug 21 '14 at 15:09

+1 to @Grady Player's answer: damage is probably the cause. You've likely damaged the roots or vine, possibly in a way you can't see.

I tried transplanting pumpkin last year and even though the transplants were 2 weeks ahead of the direct-seeded (and the same variety), they were quickly outpaced by the direct-seeded plants.

My advice would be to throw away the wilting/damaged plants and start over by planting in the place where you want them to finally grow, and then don't move them.

Or: (I haven't tried this approach yet, but I am this year), if you want the plants to germinate inside so you get faster/better germination, set them out immediately after the seeds sprout. I'm going to use soil blocks so that there's very little chance of damaging roots or vines. (I'll come back and edit this with the results...)

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yeah I am using large peat-pots this year, I have already seem some mixed results... I am also trying some larger container zucchini... good luck to us all! – Grady Player May 10 '12 at 22:34

If exposure to cucumber beetles is a possibility, then it may be bacterial wilt, for which there is no treatment. The test for this is to slice off the stem of an infected plant and squeeze out some sap. If it's stretchy/slimy, it's wilt.

I think this is a problem in the UK too, but I'm not certain.

We've lost a lot of cucumber plants to this, but always much later in the season.

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I think I would have noticed them. They're in a fairly sealed greenhouse and, with the quality of the British weather of late, I don't think we have much in the way of wildlife around besides slugs. – Aziraphale May 10 '12 at 17:54

Identical problem in the greenhouse here. I suggest you eliminate any suggestion of draughts. Worked a treat for me.

Update: I was wrong. It wasn't the draughts. By coincidence I happened to drape some net curtain in the greenhouse, shielding the plants from whatever weak sunlight there is. Bingo ! They revived in 24hrs.

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They are way too hot in the greenhouse: try to regulate it better and more evenly throughout the greenhouse.

If your house was made of glass or plastic and you hardly ever opened a door or window you would wilt like your cucumber plant.

Do not try to compensate with watering because cucumber plants don't like to stand in water. If you have them in a tray and water the soil, not the plants' leaves.

And please remember cucumber plants like HEAT not sunlight; you will burn the leaves and they will go crispy.

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I also have the same problem with my cucumber plants wilting. My plants were really happy indoor until I decided to suddenly move them out. The leaves are really weak like you said. I also think it might be because of the heat and because of overwatering as I too have had the same problem but after cutting down on the water and placing them in a shadier and hotter spot they seem to be recovering

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I had pretty much the same thing happen last year. I think I just kept them indoors way too long before transplanting (they were huge and I even got a fruit before transplanting). I think that's your problem, too. I'm not sure the ideal size to transplant, but I'm pretty sure eight inches is too long. After that, I just direct-seeded new seeds outdoors and they were fine. Granted, I should have used heat/drought-tolerant varieties.

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