Ideal spacing for plants in a butterfly garden?
I have a certified Monarch Way Station, based on the variety of milkweeds and nectar plants and lack of pesticide use, etc. However, when I applied for the certification they mentioned the importance of maintaining appropriate spacing between plants. I've been letting the perennials spread and fill in and then put annuals where I have more sun and space. This year was warm and moist--perfect conditions for seedlings--and I had a bumper crop of new milkweed plants. As seedlings they were ideal for the Monarch cats in their first few instars. But there were literally thousands of plants. They were like a ground cover underneath the taller, established plants. If I thin them, how much space should I leave between them? Or should I just let them find a balance on their own? I usually love to let Ma Nature be in charge. Let me know what you think.