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Hardening off alder seedlings
Since January I have been growing alder seedlings under light - and
all the time awaiting the gentle touch of a policeman on my shoulder concerned about my electricity bills! The plan is to grow them up to a size where they could be grafted onto the cone-bearing spurs of adult trees. I have started to reduce the lighting from 24 hrs to something nearer 12 hrs. The temperature inside the light box is about 22 °C. The seedlings are now about 20 cms high and about 3 leaf pairs down from the top the stems are about 2 mm across. The seedlings are growing individually in a seed-tray with cells 4 x 4 cm x 8 cm deep. Obviously I now have to think about hardening them off to survive outdoors. Any suggestions? I remember my mother used to use cloches in such circumstances, but she's long dead now. Would they be of use? Michael Bell -- |
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