I put out some seeds from Michigan and Minnesota in the fall of 2018, and got several plants to show and grow last summer, but they never flowered or had pods. They only got about 12" tall. They all came back out this summer and are now waist high, but still no flowers or pods, but I did see a Monarch caterpillar a few weeks ago. For those with abundance of them, is this simply a maturity thing and takes a few years to get going or is it a sunlight thing (they get mainly afternoon and evening direct sun), or maybe they can't take the southern heat? They have also been babied with miracle grow...