How deep do the roots need?
We have huge tree stumps bordering our backyard (not on our property but touching it). I can't dig into the soil there b/c it's all tree roots, as you can imagine.
SO, we're going to build a raised bed to plant things in.
We're thinking of making it 2 feet deep. Is that deep enough for a clematis to thrive and survive overwinter in my zone 6b northern NJ?
I HOPE SO! Please let me know. P.S. Can we get away with making it 18"?