A friend of mine desperately needed help with her extensive plantings and found help through the local gardening club. The helper had to move into an apartment and no longer had access to a garden, so she appreciated the opportunity to get her hands dirty again, and of course the extra cash didn't hurt.
This was the perfect solution for both people, and there was very little training needed, since the helper had been a serious gardener at one point.
I hope you're able to find the perfect person for your needs!