Sorry, can't comment on Kingwood, but if you go up that way and have the energy after Kingwood, you should stop at Wade & Gatton Nurseries. W&G is outside Bellville at 1288 Gatton Rocks Road. It's about a 10 minute drive from the I71 and SR13 interchange. They have huge display gardens of hostas and daylilies. It may be a little early for the daylilies, but the hosta gardens alone are worth the trip. They are closed on Sundays.

Here is a link that might be useful: Google map