How long have you been at it as a hustle? These things can take time to build up, and you need name recognition in that audience.
What have you tried to increase your audience/client base?
Do you advertise, and do you ship? Truck? Door to door?
Do you take displays to farmer's markets and such?
I grow a lot of fruit trees/herbs and such, but mostly end up giving them away. Also had little luck selling, but honestly have not tried hard.