Hi Davids62. The soil is a potting mix that is from a local nursery here in Vancouver. It's Southlands Nursery's brand of soil. The pots are fertilized every week with a mixture of 15-30-15 liquid fertilizer - one to two large watering cans per container. The containers range from 20" wide to 36" wide. Also they are on drip irrigation so they get constant moisture daily which really helps. I hope this helps!

Thank you for your kind words on my work!

Glenna Partridge