Return to the Greenhouses & Garden Structures Forum | Post a Follow-Up

 o
Growing time gained by greenhouse?

Posted by brendasue 6 (My Page) on
Thu, Mar 18, 10 at 6:25

This is our first spring/year with a greenhouse. It is 15x33' and we put 3 barrels filled with water for heat retention. We are located in CT.

Can anyone wager a guess on how much time we've added to the growing season in both spring and fall? I know we were able to overwinter broccoli & spinach (which froze & re-coperated).

I know there are many variables-I was hoping for your best guessimate?

Brendasue


Follow-Up Postings:

 o
RE: Growing time gained by greenhouse?

I've heard many people refer to a month gain on either end of the season but you can always stretch anything further. It all becomes a matter of cost and economics. I've tried the water barrel thing but you really don't get much unless you cover the walls with water barrels. If you don't have a backup heat plan for frost sensative crops you can loose your crop in one night so I'd advise at least a propane heater.

Two film layers, inflated, save a bit more heat and you could even plan to use row cover material within the greenhouse.

I rely on woodstoves for heat and so I better go check on mine now.


 o
RE: Growing time gained by greenhouse?

Thanks Bmoser. I was wondering how much sooner to plant my seeds than normal-looks like a month. Working in the soil in the barrels it's really warm-matter of fact I don't think it ever froze.

It's not heated. I am thinking of a small heater though for that month or so extension you are talking about. We'll see....unattended heaters make me nervous I just need to get over that.
Brendasue


 o
RE: Growing time gained by greenhouse?

  • Posted by kudzu9 Zone 8b, WA (My Page) on
    Fri, Mar 19, 10 at 2:43

Three barrels in a greenhouse that size is not adequate to make much of a difference. A supplemental heater would help, although a small one may not do what you need. You really need to do some calculations to determine how much heat you need to supply to get the effect you want, and thus determine the minimum size heater that will work.

Here is a link that might be useful: GH calculator


 o
RE: Growing time gained by greenhouse?

Brendasue,

We also have an unheated greenhouse in chilly zone 4, augmented with lots of 5 gallon buckets painted black and filled with water. This has extended our growing season enormously.

I start cold-hardy plants like spinach, broccoli and salad mixes in late Feb/early March. I will start my tender seedlings tomorrow. This is more than a month ahead of my old schedule for the cold-hardy stuff and exactly a month ahead for the tender plants (which I used to start indoors under lights).

On the other side of the season, we keep tomatoes growing until Nov, enjoy salads into December, and grow carrots year-round. Basically we turned our 6 month outdoor season into a 10 month season.

We don't want a heater for a bunch of reasons, but when it's colder than I want I can adjust by moving containers into a warm part of the GH, covering things, using heat mats, or as a last resort, bringing containers in the house. This all seems to work very well and I have no desire to make the GH warmer.

Over time you will figure out the schedule. My best advice is to keep detailed notes so you can learn from year to year.


 o
RE: Growing time gained by greenhouse?

For next winter I'll add more barrels, I have many just hanging around. I didn't realize 3 weren't enough! I have this fear of something going wrong and a fire starting...I really really don't want to put heat unless absolutely necessary.

Karen in MT, I'm glad to see it's working for you. I was hoping to get similar useage from the GH-I think I'll model yours and take it from there. We're in Z6.

Thank you all for your advise!
Brendasue


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Greenhouses & Garden Structures Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here