Sowing Winter Crops in the Growing Dome

Sow your seeds in early fall to prepare for your Winter Garden:

flowers blooming in a greenhouse during winter

If you grow in a Growing Dome, or greenhouse, or even want to try to extend your season in an outdoor garden, the time has come to sow seeds for fall and winter gardening.

If you sow in late August to early September, your seeds will germinate and grow into well established plants by November, before the snow really starts to fly.

Winter time seems to be arriving earlier every year due to climate changes. There is still time to sow for winter and fall, but you will need to get started soon!

Starting and Transplanting Vegetable Crops:

Easily survive transplanting – always harden off transplants

  • Broccoli
  • Cabbage
  • Cauliflower
  • Brussels Sprouts
  • Chard
  • Collards
  • Strawberries
  • Lettuce
  • Spinach
  • Herbs

Require care in transplanting – always harden off transplants

  • Carrots
  • Kale
  • Kohlrabi
  • Spinach
  • Parsley
  • Mustards
  • Celery – requires care in transplant, but recommend transplanting in CO due to long season growing needs (very slow growing).  
  • Leeks – ok to transplant, but require care.  ~95 days to maturity after transplant, 125 after direct seeding. Transplant starts when leeks are about pencil thick. Leeks need to be hilled or mounded during growth.  
  • Radishes

Difficult to transplant/not recommended

  • All roots crops
  • Peas

Alliums (biennials grown as annuals)

Onions – recommend planting from sets/bulbs. Growing onions from seed can be difficult as most varieties have a long growth to maturity (up to 300 days). Always plant long day or day neutral varieties in CO (for latitude 37-40N). Onions typically planted in spring for fall harvest – pay attention when choosing varieties if you are interested in storage.

Garlic – recommended planting from bulbs/cloves. Plant 2x the depth of the clove with the tip end pointing upwards, cover with soil and mulch for overwintering.  

*Onions are heavily influenced by photoperiod.  During long days they put on top vegetative growth and then the plant switches from vegetative growth to more below ground growth after the summer solstice on June 21.  The key is striking a balance: if you plant onions too early, a lot of cold days will trick the plant into flowering and going into a reproductive phase in the first year; planting too late means that the onions won’t put on enough top growth to produce photosynthates and produce a large bulb.  


Can control climateCosts including infrastructure, containers and soil
Season extensionIncreased labor and skill needed
Easy to manage and monitor seedlings intensivelyNot practical for all crops

If  you’re contemplating getting a Growing Dome® this fall, the key is to start sowing seeds now. By the time you install and prepare your Growing Dome with soil, your plants will be established and ready to transplant into your new indoor beds. Get started now and have fresh greens and produce all winter long!

Create Your Own Growing Dome Quote Online or Call us to order:

Fish in an above ground pond in a greenhouse

Use our helpful Create a Quote tool to identify the perfect size and price of a Growing Dome for your growing needs.

You can call our sales department to get a quote or with any questions at 800-753-9333 or If you are hoping to get your Growing Dome completed this season, call us to place your order today, space is limited for the Fall 2017 season. Please feel free to join our Growing Dome Enthusiasts group on Facebook.

author avatar
Kesy Curtis
Growing Spaces has given me a different perspective on my life, my health, and has exponentially increased my quality of life.


  • We do not get a lot of sun here in southern Michigan. Not sure a dome here would get enough to “work” ?!?! Anyone in Michigan have a working dome. No heat, solar electricity??

    • Rebekah,

      We have Growing Domes in all 50 states and 14 different countries. The Growing Dome is designed for the Rocky Mountain climate, but is suitable for many different locations, including Michigan. We have several Growing Dome owners in Canada that have reported great success with the Growing Dome. The Growing utilizes passive solar design, which helps heat and cool the greenhouse, no matter where you live.

      As long as you get about 4-6 hours of sunlight every day, the Dome will perform well. Some crops that are photosensitive may not perform as well at certain times of the year, but you can always count on cool season crops to perform very well.

      The Pacific Northwest is notorious for having the least amount of sunshine on average than any other location in the U.S. We have several customers in Oregon and Washington that are successfully harvesting crops from the Growing Dome. Some customers in this region insist on growing photosensitive crops, such as tomatoes, and they simply supplement with artificial light a few hours a day (when needed) to make up for the lack of sunshine.

      Check out this video, where Udgar, the owner of Growing Spaces, describes the criteria for proper site location:

      I sent you an email as well.

      Talk to you soon,


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