Greenhouse cucumbers need careful attention but as few as two plants can be very productive.
How to grow cucumbers
– Three weeks before planting, prepare a special cucumber bed on the greenhouse floor, using a mixture of 2 parts well-rotted organic manure to 1 part peat or loam.
– Build the beds 6Ocm/2ft wide, 45cm/18in deep with a domed top. Cover with a 15cm/6in layer of peat or loam.
– Water liberally and keep the temperature constant at 21-25/7o-75F.
– In late winter/early spring sow seeds singly in 9-cm/3 Vs-in pots at the above temperature.
– After germination, give the seedlings maximum light and reduce the temperature slightly.
– At the three-leaf stage, pot on to 14cm pots. Water and spray very thoroughly to maintain essential humidity.
– After 4 weeks, work a general purpose fertilizer into the prepared beds and plant the cucumbers out with a little of the rootball showing (this helps water drain away).
– The plants need the support of wires or strings as they grow upwards and outwards.
– Stop the main stem when it reaches the roof and allow the cucumbers to develop on side branches, which should be stopped after 2 leaves.
– Grow all-female plants in order to avoid fertilization, which causes bitterness.
– Maintain high temperatures and humidity.
Pick cucumbers when young and succulent, at about 30cm/12in.
Pests and Diseases
Glasshouse whitefly, root rot fungi, grey mould.
– Green house growing
– Prefers sunny area
– sow seeds 1cm/0.5 inch
– thin to 90cm/3ft apart
– crop duration is 4 months