Kids and gardening should be a great match -- dirt, growth, a little bit of magic. In practice, it falls apart fast if you pick the wrong project: something that takes six weeks to show any progress will lose a six-year-old's attention by day three.
The fix is picking projects for speed and drama, not for what's "educational" on paper.
A few practical tips: let them do the actual planting (messy hands are part of the appeal, not a bug), check on the project together at a predictable time (right after school works well), and don't worry about failures -- a project that doesn't work out is still a good conversation about how growing things sometimes just doesn't go as planned. That's true for us too.
Our Family-tier membership builds a kid-focused project into every box, matched to what actually grows fast where you live, with a simple activity sheet included.