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I've just planted my q's into the greenhouse today. I make sure the stems don't get too wet by sinking a piece of drainpipe or a plant pot with the bottom cut off into the soil nearby. Then I only water into that and the water goes down to near the roots. Works for me, not had any rot so far.
If growing in a GH, in a pot, on a hot day plants will wilt very quickly if there is insufficient ventilation or lack of moisture in the compost. Has the weather been particularly warm or have you had clear blue skies.
Yes, in containers in particular, but even in the ground they will wilt on a hot day regardless of how much moisture there is in the compost. They usually perk up again when things cool down.
If it isn't a temperature issue it could be various other things. How old are the plants and where are they?
I always water mine from the top and never have problems doing it. Mine are in pots in an unheated green house. I never put them there until temperatures are favourable i.e. above 7deg. constantly at night. The greenhouse is kept well ventilated. Are your plants in good compost and well ventilated ? As Italophile says it could be other things than temperature. In one of my books it points to Basal Stem Rot. This is caused by over watering and too much water at the base of the stem. Symptons shown are the leaves wilting and the plant collapsing. Hope this is of some help.
i,ve lost 5 cuc's this year, 2 in the window sill, and 3 replacements which i planted in the greenhouse, ( not heated). They all rotted and wilted from the stem base, i got 1 more left looks good, 7" holding on in there, seems too much hassle i think,
I have good size ones on my plants in grow bags in a unheated greenhouse but although I think they are ready they are not turning green does anyone know why or how to green them up ?.
On a very recent Gardeners World, Monty said to water a cucumber via a pot inserted next to the plant so the plant stem doesn't get wet and so be liable to rot.