How can I over winter my purple coneflower perennial which is growing in a...
How can I over winter my purple coneflower perennial which is growing in a large pot outside? Will it survive the winter in the pot or should I put the pot in the ground or is there a better way to over winter plant without bringing it indoors?
The rule of thumb is that plants in containers can overwinter outdoors if they are hardy to two zones colder than your zone. This is because air temperatures get much colder than soil temperatures and can kill the roots of containerized plants. Purple coneflower is hardy to zone 4, so you should be fine.
Be sure it does not go into winter with dry soil. The soil should have moisture in it if it freezes.