SOIL TEMPS & LATE SEASON FERTILIZATION. Optimum soil temperatures for cool season root growth occur within the 50 to 64 F range. However, root growth function continues until soil temperatures reach freezing (32 F). Late season fertilization treatments can still be made, but the use of proportionally more quick release nitrogen would be recommended. Once soil temperatures fall below 50 F, microbial activity drastically drops off, which could influence the release rates of slow-release fertilizers that depend on microbial (temperature) breakdown for release. Slow release nitrogen sources can still be used but those that are not temperature dependent, like slow release carriers that release by dissolving in the presence of water might be more efficient.
PREVENTING PINK SNOW MOLD. In the northern United States, snow molds can be a problem for homeowners in early spring. At this time mowing and removing leaves until the lawn ceases top growth can reduce the severity of pink snow mold. Lawns covered with leaves provide a cool wet environment that is favorable for this disease. Taking a little time this fall to remove leaves will help reduce the severity of pink snow mold next spring.
PLANTS & COLD. With the first cold blast of winter hitting the northern United States this week, concern arises over susceptibility of landscape plants to winter injury. Although winter injury symptoms usually do not appear until late winter or early spring, steps need to be taken in the autumn to protect plants at risk. Broad-leafed evergreens (azalea, boxwood, holly, etc.) are susceptible to winter injury in many parts of the country. These types of plants should receive protection from wind and sunshine during the winter. A common winter injury associated with broad-leafed evergreens is winter scorch, which occurs when these plants dry out (desiccation). If these types of plants enter winter under drought like conditions, watering the plants prior to winter may be beneficial. Fall fertilization of these plants is discouraged. If winter injury should occur, common symptoms include a lack of emerging leave or leaves that emerge then wilt and die, a lack of flowering, and on evergreens browning of leaves or needles is a common symptom.
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