The best time to plant hardy annual and biennials is when the summer heat has left, but before the season is over. It’s a very narrow window of time for most people, but with a bit of planning you can make sure that you plant at the ideal time.
But when is the best time?
Too soon, and your plants won’t do well. Cool season annual flowers like cool and moist conditions to grow in, and if temperatures are too hot you may find a lot of issues with growing them including finding it hard to establish, a higher disease rate, and other issues that come with warmer weather.
On the other hand, you don’t want to plant too late - if too late in the season, your seedlings can’t get established and may not survive the winter. Or in the best case scenario, your seedlings may not die - but they won’t have time to get their roots established either, which means that you miss out on your advantage of fall planting.
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