I am a retired horticulurist and landscape contractor. Our family business is in it's third generation here in the Columbus, Ohio area. Monrovia is a very reputable company. They supply garden centers and landscape contractors around the county. Due to freight costs, we have been buying nursery stock from mostly Ohio growers. I don't know if Monrovia or any of the large nurseries propagate their own hosta or buy the plugs from someone that specializes in hosta propagation. We used to buy plugs/small cell pack size hosta from a wholesale nursery called Q & Z, now out of business. We would basically grow our own hosta from their plugs. Many of the wholesale suppliers, like Q & Z did, tissue culture their plants. I think if you bought from a reputable garden center, you should be safe. I'd avoid hosta from the big box companies and your local grocer that is only selling them as a seasonal add on item, no matter how cheap the price. Who knows where they come from.