Fall planting takes advantage of warm soil and cooler temperatures to form roots before winter, while planting in spring allows the plants to establish before the heat of summer. As long as the plants have 6-8 weeks before winter to set their roots, they should do fine being planted in the fall. But if it is more convenient for you to plant in the spring, we ship then too! To request a specific ship date for your order, indicate your choice online during checkout or call us at 1-800-862-5243 with your request.