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Extend Your Growing Season with Protected Cultivation Methods

July is a good time to start planning for season extension, whether
that means buying a new hoophouse or replacing worn-out row cover and
frost fabric. Here are some ideas that can help you make fall and winter
as profitable and productive as summer.

If
you can provide shade and moisture, you can get many cool-weather crops
started in the heat of summer. Beets, carrots, chard, lettuce, onions,
radishes, and turnips will actually germinate at soil temperatures of
85-95F (30º-35ºC), though they prefer it about 10º cooler. Escarole,
endive, kale and kohlrabi won’t germinate above 80ºF (27ºC), and spinach
won’t germinate above 75ºF (24ºC). To lower soil temperature, consider
erecting hoops covered with shade cloth. Johnny’s sells a knitted shade cloth that provides good ventilation when held above crops on Quick Hoops™. Sizes are available to perfectly fit Quick Hoops™ low tunnels or high tunnels.
Soil should be watered thoroughly after putting on the shade cloth and
before planting to give the soil a few days to cool off. Fall crops need
ample moisture to get them started in summer; use drip irrigation and
turn it on every day to keep the top few inches of soil moist.

Be prepared for unexpected frosts as the weather cools. Johnny’s row covers
are available in a number of weights and sizes to provide exactly the
protection you need on fall crops. A wide piece of heavy row cover can
be pulled over multiple beds quickly when a heavy frost threatens. Row
covers also can be used on hoops to create a protected microclimate all
fall. The Quick Hoops™ bender makes perfect hoops from locally available
electrical conduit, and Snap Clamps
make it easy to attach row cover or poly for tight, stable low tunnels.
Hoop Loops are pre-formed wire hoops with loops that allow you to
secure twine down the length of the bed. When covered with row cover,
the hoops and twine create a mini-greenhouse that prevents the covering
from abrading plants.

In September, plant in the hoophouse. You have plenty of time to get
one or more crops of beets, broccoli, cabbage, Chinese cabbage, endive
and escarole, greens, kale and collards, kohlrabi, lettuce, radishes,
spinach, and turnips. Plant growth will slow as the days get shorter,
but the cooler weather of fall will keep crops healthy. Plant enough
that you can harvest for many weeks.

Carrots can be planted for harvest all winter, in a hoophouse or low
tunnel. Carrots will grow to maturity in fall but can be left in the
ground to harvest as needed and they will get sweeter and more flavorful
from in-ground storage. Spinach will continue to grow most of the
winter, so young leaves can be picked repeatedly.

Plant a crop of overwintering spinach in low tunnels covered with row
cover in fall and poly in winter. Seed spinach before the first frost
and the plants will reach 3-4 inches in diameter before winter cold
stops their growth. They will resume growth in late winter and be a
month earlier than spring-sown spinach.

Visit Johnny’s Selected Seeds for more free
information about growing produce, herbs, cover crops and flowers.

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Reprinted

from JSS Advantage July 2011