Regarding soil depth. We have created a border with sleepers at the front of the house which has about 4 inches of soil on top of the parking gravel. Amazingly most plants do well - its north facing so less chance of being fried like the back. Mind you everything just grows in the gravel anyway 🤣
I’m not sure on buying seeds in your region but there are many indigenous species of penstemon in California so those in particular will grow really well for you
Regarding soil depth. We have created a border with sleepers at the front of the house which has about 4 inches of soil on top of the parking gravel. Amazingly most plants do well - its north facing so less chance of being fried like the back. Mind you everything just grows in the gravel anyway 🤣
I really appreciate the update and the ability to live with creeping buttercup. You are a saint.
I struggled to find Penstemon seeds or seedlings here in the SF Bay Area. Do they not do well here?
I’m not sure on buying seeds in your region but there are many indigenous species of penstemon in California so those in particular will grow really well for you