I can't plant mushroom

So I finish the mission and get the mushroom planter.But I can’t use it to plant mushroom.

I want to know what that red icon mean? Is it means I do not have the seed?
If I am right,how can I find the seed?

The “seeds”, in this case, are colonies

You can buy them from merchants or craft them with the Herbalist!

Thank you for your reply!

I want to know how herbalist craft the colonies? I didn’t see any colonies in both exploration gardens.

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It’s a recipe, just search for “colony” in the crafting screen.