That info should have been included by your supplier. However, this is what Plant World seed suppliers advise. I have used them many times and find both their seeds and advice to be reliable - https://www.plant-world-seeds.com/store/view_seed_item/3157
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw