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when to plant out Cosmos

Hi ive indoor grown Cosmos. They are coming on well. Im not sure how big the plants need to be before they are planted out?

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  • Nanny BeachNanny Beach Posts: 7,905
    It greatly depends on where you live, the temp, and how big they are.  You need to harden them off outside to get used to it being colder, especially if you have grown them indoors. 
  • FireFire North LondonPosts: 15,649
    We had quite a frost last night in London. White rooves.
  • It greatly depends on where you live, the temp, and how big they are.  You need to harden them off outside to get used to it being colder, especially if you have grown them indoors. 
    hi 🙂. been hardening them off so they are used to the cold. i think il wait til next week & check the temp then
  • B3B3 South East LondonPosts: 22,361
    once mine have germinated, I leave them outside. I also sow some seeds in pots outside. This year's outside ones  have germinated and the others are growing fine.. I'm not sure how this works further North, but it's worked for me here for a long time.
    In London. Keen but lazy.
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