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I have been growing "RussianI have been growing "Russian Giant" sunflowers, and in order to make them very big, the packet said it should be propagated indoors in "early spring". Slight problem - a month and a half later they are nearly 2 foot tall and growing at about an inch per day. I can't keep them indoors much longer, and our greenhouse is only 6ft x 6ft and that will need to contain other plants as well. Apparently they should be planted out after all risk of frost has past - but here that's nearly 2 months from now. At what size can I plant them out safely - even if there will be a frost - and what can I do to protect them from frosts?

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