Is pollination of tomatoes adversely affected by the high tunnel?
No. Tomatoes are self-pollinated. In research at the University of Missouri, we have not experienced pollination problems with tomatoes in a high tunnel. Air movement, which reduces humidity and vibrates the flower, is important for good pollination. If you have to keep the vents closed for an extended period of time, you may want to shake the cages or stakes to facilitate pollination. If you are using rowcovers, you should remove them when your plants are flowering and the sidewalls are rolled-up. If temperatures are projected to get 55F or less, the rowcovers should remain on the plants.
