We know it’s autumn when the leaves start turning color. Here a Pin Oak brightens the landscape. It’s time to harvest winter squash and pumpkins, but if your squash isn’t quite ready, perhaps it will have time to continue ripening.
In Port Townsend, our typical first killing frost arrives by the end of November. If autumn temperatures drop slowly over time, plants get acclimated. The high concentration of sugars acts as ‘antifreeze’ in the protoplasm and this is what gives kale and other crops a sweeter flavor after the first frost. But if warm weather prevails until a sudden hard frost hits, then plants are not prepared. Sometimes in November the temperature can suddenly drop twenty degrees! Next month pay attention to the weather forecast and be ready to use floating row covers on crops and newly planted broad-leaf evergreen ornamentals. Forecasts for the next three to six months seem to be leaning toward La Niña but one forecaster described it as “a weak event”. NOAA posted this
Garden Chores
- Leaves: Rake and compost, or save for mulch.
- Lawns: Over-seed existing ones with white clover, yarrow, English daisy and other flowering plants for pollinators.
- Mulch: shrubs and garden beds for winter protection and weed suppression. The increased organic matter will eventually feed the soil ecosystem. (This repeat from last month reinforces how important it is!)
- Plant garlic: 2” deep in well-drained soil. Space cloves 5 inches apart with the tip up. Mulch with straw. Prevent disease by rotating crop every 3-5 years. Certified disease free garlic or saving your own is best.
- Fruit Trees: Rake and remove any diseased dried leaves, rotten- and mummy-fruits to prevent disease.
- Apple tree pests: Examine fruits for coddling moth larvae damage. The Hortsense link offers preventative measures for next year.
Winter squash can be slow to fully mature. One way to encourage this is to remove all small and new squash in September. This allows all the energy to go to the larger, more mature squash. The signs that a squash is mature include a bright yellow spot where the squash touched the ground, the stem becomes brown and corky-textured. Also, as the squash skin toughens up, it becoming duller, and even a bit waxy. It may difficult to make an indentation with your fingernail. These contribute to a good storage crop.
Tinker loved growing the Lower Salmon River winter squash. This variety of Cucurbita maxima is one of the few heritage crops from the PNW, and is known from the Salmon River area of Idaho. It has a distinctive flavor and texture. Seeds are available from Adaptive Seeds.
If you want to taste Lower Salmon River, Midori Farm grows it and the Food Co-op has some now. It takes about 90 days to mature. It can withstand a couple of light frosts although the first one will probably kill the foliage. For Cucurbita maxima aficionados, check out this Johnny’s Seeds critique of flavor and yield for varieties.
After the fall equinox, plant growth slows. We have not had frost yet in early October 20224, so crops are still growing well. Plants are able to sense cold temperatures and respond by producing carbohydrates. In vegetable crops, the high concentration of sugars acts as ‘antifreeze’ in the protoplasm and this is what gives kale and other brassicas a sweeter flavor after the first frost. For more on winter gardens see the OSU Extension Publication
Sustainable Garden Design 