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9 Greenhouse and Season Extenders

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9

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Greenhouses and
Season Extenders

C

ertain crops grow just fine in Alaska’s short growing
season, even when direct seeded (planted outside in
the spring), while other crops benefit greatly from
season extension techniques and/or greenhouses. Cool
season crops that do well without any help include potatoes,
turnips, radishes, beets, lettuce and other greens, peas and
carrots, which can all be direct seeded. Crops in the Brassicaceae family (broccoli, cabbage, cauliflour, kale, etc.), are
also cold hardy, although seeds should be started indoors to
ensure they reach maturity by the end of the growing season. Many warm season crops that grow well with a little
help from season extension techniques include basil, snap
beans, strawberries, zucchini and other types of squash, to
name a few. Tomatoes and cucumbers are ubiquitous greenhouse crops. Although season extension techniques require
additional time and money, for crops such as strawberries
it’s usually worth the additional effort and expense. In general, more expensive techniques afford a greater degree of
control over and ability to use an outside heat or ventilation
source. With the additional costs associated with structures
such as a greenhouse, it makes sense to grow higher value
crops. Any season extension technique will require some
additional expense and labor and so two questions could be
asked: Is the crop valuable enough (to you or at the market)
to warrant the additional expense? Can the crop be grown
successfully without additional help?

❂ Topics in this chapter
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Selecting a site
Season extenders
Greenhouses
Greenhouse benches and
beds
Greenhouse utilities
Popular greenhouse crops
in Alaska
Glazing and covers
Watering systems
Natural ventilation
Pollination

By Pat Patterson, Extension Program Assistant,
Lane County, Oregon State University.
Edited by Heidi Rader, Extension Faculty,
Agriculture and Horticulture Agent, Cooperative
Extension Service, University of Alaska Fairbanks.
Adapted from Greenhouses for Home Gardeners:
Structures and Equipment, HGA-00337, University
of Alaska Cooperative Extension Service.

170 • Greenhouses and Season Extenders—Chapter 9

Selecting a site
The most important factor in selecting
a location for a cold frame, hoop house,
high tunnel or greenhouse is sunshine.
Protection from strong winds is also very
important since they are more susceptible
to wind damage than many other types of
construction. Other considerations inc...
Greenhouses and
Season Extenders
9
Topics in This chapTer
By Pat Patterson, Extension Program Assistant,
Lane County, Oregon State University.
Edited by Heidi Rader, Extension Faculty,
Agriculture and Horticulture Agent, Cooperative
Extension Service, University of Alaska Fairbanks.
Adapted from Greenhouses for Home Gardeners:
Structures and Equipment, HGA-00337, University
of Alaska Cooperative Extension Service.
Selecting a site
Season extenders
Greenhouses
Greenhouse benches and
beds
Greenhouse utilities
Popular greenhouse crops
in Alaska
Glazing and covers
Watering systems
Natural ventilation
Pollination
C
ertain crops grow just ne in Alaska’s short growing
season, even when direct seeded (planted outside in
the spring), while other crops benet greatly from
season extension techniques and/or greenhouses. Cool
season crops that do well without any help include potatoes,
turnips, radishes, beets, lettuce and other greens, peas and
carrots, which can all be direct seeded. Crops in the Brassi-
caceae family (broccoli, cabbage, cauliour, kale, etc.), are
also cold hardy, although seeds should be started indoors to
ensure they reach maturity by the end of the growing sea-
son. Many warm season crops that grow well with a little
help from season extension techniques include basil, snap
beans, strawberries, zucchini and other types of squash, to
name a few. Tomatoes and cucumbers are ubiquitous green-
house crops. Although season extension techniques require
additional time and money, for crops such as strawberries
it’s usually worth the additional effort and expense. In gen-
eral, more expensive techniques afford a greater degree of
control over and ability to use an outside heat or ventilation
source. With the additional costs associated with structures
such as a greenhouse, it makes sense to grow higher value
crops. Any season extension technique will require some
additional expense and labor and so two questions could be
asked: Is the crop valuable enough (to you or at the market)
to warrant the additional expense? Can the crop be grown
successfully without additional help?
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