The secret to grow Cherry Tomatoes? Light, soil and water! And a few extra bits and pieces⦠There is actually a lot involved in growing these teeny tiny wonders. The best time of the year to plant the seeds is Spring. They may be ready to harvest within around 50 to 65 days. They will grow very high if you let them. And there will be a lot of pruning involved just so they can grow higher and higher. Learn more here.