Keep plants disease free
The combination of low light, cold temperatures and high humidity after watering makes the perfect condition for fungal rot. Reduce the risk of this disease by regularly going through your plants, picking off dead or yellowing leaves. Deadhead old flowers and space plants out as much as possible. Water sparingly and ventilate when temperatures allow. Clear up the plant debris from the greenhouse and put it on the compost heap.
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Check plants regularly for signs of rot to help prevent diseases