I would love to see pictures of your seedlings. I think my oldest seedlings are 10 months, but most are 3 months old. Is Rust harmful to plumerias? Its humid here spring through early summer, but late summer is less humid. I do mist my seedlings a couple of times a day, I know misting doesn't do much but any little bit helps lol. I got my seeds from a friend and I think she buys the seeds from Brad's Buds and Blooms. A 10-15 acre forest would be breath-taking. You would be the Johnny Appleseed of plumerias lol.