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Could anyone advise me if I sow sweet peas in a greenhouse would I need to apply heat .


They would need a temperature of between 13 to 18 °C for consistent germination which is a bit of an ask in an unheated greenhouse during January. You could start them off indoors and then move them to a greenhouse as soon as they've germinated. Alternatively wait until early March and they will be fine sown in a cold greenhouse. 

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