I already have a plan and layout for what I want to do with the shop.

[it helps that he's been in Nippon for a better part of the year, and for a near full cycle of seasons. which means he's also been able to see what seasonal flora grow in different parts of the country]

As for my artes... It's a skill I've honed for most of my life. I've always had an affinity for earth astral artes. However, I'm not sure how I'm able to bend plant life to my will, especially from where I hail from.

[Lenegis didn't really offer much in terms of plant life; when he'd arrived on Dahna, Dohalim couldn't believe his eyes when he saw just how lush and verdent Menancia was, despite the bloodshed of slaves who were worked to the bone there. perhaps it's his appreciation of the land and his want to preserve it is the reason why he can control the movements of plants]

I realise that this doesn't answer your question. Astral energy is strange, and the beings that govern them even more so.

[he certainly won't forget the elementals he and his companions had faced, after all]