Many of us are already putting away our spades, but if you do, you’ll miss the best planting season of the year. Spring – the classic planting season – may be superior for most vegetables and annuals, but for woody plants – trees and shrubs – and container-grown perennials, fall is superior.
That’s not just my opinion. It’s the considered judgment of two expert growers I consulted last week (both produce plants for NatureHills.com, the nation’s largest online nursery).
Tim Flood of McKay Nursery is based in southwestern Wisconsin in USDA Zone 5A-4B. He explained that fall is such a good planting time because, although the air may be cool, the soil is warm. The cooler air reduces the stress on the above-ground portion of the plant and slows its growth, while the warm soil encourages vigorous root growth. Root growth continues, he adds, until the soil freezes. This root growth gives fall plantings a head-start the following spring. In fact, fall-planted trees and shrubs typically behave like established veterans in their first spring, flowering and developing a normal amount of new growth. Trees and shrubs transplanted in spring, by contrast, find the air warm but the soil still cold. That means the tops of the plants are spurred to growth while the roots are still dormant, which is far from ideal.
Fall planting is even more advantageous in the South. Tom Aubrey, who grows plants for Nature Hills in Mobile, Alabama, notes that planting can continue until Thanksgiving in his area – USDA Zone 8. Aubrey says that fall’s cooler nights when the temperatures start dropping to 70 or so, encourage robust plant growth.
One advantage of fall planting in both North and South, is that it gives the plant more time, an extra season of growth, to settle in before it has to face the heat and drought stress of summer. This is especially important in the South, where summer hardiness is often as much or more of a concern than winter hardiness, but a bonus in the North as well.
Both Flood and Aubrey recommend extra mulching for fall plantings. In the North, the extra mulch insulates the soil, helping to keep it warmer and prolong the period of root growth. In the South, the extra mulch helps to keep the soil moister and can insulate roots and the plant’s crown against an unseasonably early cold spell.
As a gardener, I also like fall-planting because this is a season of bargains at many garden centers and nurseries. Many such businesses prefer not to over-winter their left-over stock and so offer it for sale at considerable mark-downs in the fall. Sometimes, adds Tim Flood, fall shoppers also get the first crack at new introductions, plants that have been in production all year and are just entering the market.
on October 3, 2016 at 10:53 am, in the category Shut Up and Dig.