R.A.
Not sure if you're in the FW area, but the Fort Worth Botanical Gardens has a super fun Green Thumb Club. I just went to the website http://www.fwbg.org/green_thumb.htm
and it hasn't been updated beyond summer info, but in the past they have offered a weekly class in the afternoon hours just after most schools are dismissed. My mom and my son really liked it. They did walks and craft activities for fall using things found in nature and other fun stuff.