September is the month that nature starts the process of transitioning from summer to fall in Snohomish County. The days get shorter, leaves start to change color and the nighttime temperatures are cooler. There are many tasks to check off in your gardens. To find information on vegetables and fruits see the section on EDIBLES. See FLOWERS AND FOLIAGE to find monthly helpful tips for everything from annuals and perennials to trees and shrubs. Lawns do’s and don’ts can be found in LAWNS. See PLANT OF THE MONTH for our favorite plant pick.
PEST MONITORING AND MANAGEMENT
Use chemical controls only when necessary. Thoroughly read the pesticide label to ensure safe handling. The label must state that the pesticide is for the problem you are addressing.
Instead of pesticides/herbicides, consider cultural changes, physical or biological controls.
Choose the least-toxic options, and use them judiciously.
Be sure to take any unused pesticides to your local Hazardous Waste center for safe disposal.
This plant is often labeled Giant Hyssop but it is actually a member of the mint family.
Agastache grows 2-4 feet high (depending on variety) with flower spikes of lavender, apricot, orange, or other new colors. It has aromatic leaves and the flowers attract beneficial pollinators such as bees, butterflies, and hummingbirds.
Agastache has a long flowering season: from mid-summer through September.
This easy to grow plant does best in full sun with dry to medium moisture, but in well-drained soils (very important).
Prefers alkaline soil, but will tolerate poor, acidic conditions.
Dies back to bare stems in winter. These can be cut back for new growth in the spring.
Generally, disease and pest free (occasionally subject to powdery mildew).
Resistant to deer, rabbits, slugs and snails.
Deadhead spent flower stalks to promote additional blooms.
For additional information or specific gardening questions, please contact the WSU Snohomish County Master Gardeners at 425-357-6010 or send photographs and descriptions of plant or insect problems to firstname.lastname@example.org .