Grow the Pallet Garden of Turnips in clay and cool-weather. Get the turnip vegetables started early in spring at least two months before the onset of very warm weather, or plant them in late summer so that they come to harvest season. For turnip growing tips see turnip growing success tips at the bottom of this post. There are 6 cool ideas to grow the diy turnips plant. Pallet turnips in the garden always seemed like so much trouble to me. At the time of planting i tended to lose sight of those dark shiny seeds of turnips in the soil in pallet box or wood. Plant them too thickly, then spend the next month with enjoyment, so! Grow it and Eat it.