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Forum: Beginner GardeningReplies: 5, Views: 98
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Brainerd, MN

April 6, 2007
11:09 PM

Post #3363812

I have an eight foot portable FlowerHouse greenhouse I was given as a gift. The material is translucent so while light does get through it, it is considerably filtered. I'm wondering how this works. I've had seedlings growing under 16 hours of daily warm/cool florescent lighting since February. It will soon be time (temperatures permitting) to pot them and try out the greenhouse. Will enough sunlight actually get through this material? I realize it must or the contraptions wouldn't be on the market but I don't quite understand why they work. How come too much distance with florescent lighting can make seedlings get leggy yet filtered sunlight is apparently not a problem? Do plants not get leggy after a certain seedling growth stage, or what?

I'm also wondering how cold the nighttime temperature can be inside the greenhouse before the plants would be damaged. (I'm in Minnesota -- zone 3b.) Some of my seedlings (especially the Dahlias and Strawflowers) are getting very large and hogging up the florescents so I need to get them out of the way, plus I have Round 2 of seed sowing coming up soon. Thanks in advance for any info and help you can give. This has been such a helpful garden site.
Oregon City, OR
(Zone 8b)

April 10, 2007
2:48 AM

Post #3374323

In your zone 5, it's important for plants to get the higher temperatures and humidity that are not available at this time of year, which is what your greenhouse is meant for.

Whether they will get enough light, I personally don't know, since I've never tried to grow any plants during my brief stay in your region, but I do know that red & blue frequency lights are the grow light frequencies, and will help your plants with their photosynthesis.

This message was edited Apr 9, 2007 11:50 PM
Mid-Michigan, MI
(Zone 5b)

April 10, 2007
3:03 AM

Post #3374327

I have the same question!! My seedlings (not really even seedlings anymore) are hogging up all my shelf/light space in the basement. It's still too cold here to put them in the GH...the night time temps dip below freezing. I show zone 6a, but tend to be a 5b most of the time.



Anne Arundel,, MD
(Zone 7b)

April 10, 2007
4:31 PM

Post #3376500

Re the light intensity- I suspect we don't realize just how bright the outside is compared to flourescents. The light from the flours diminishes so quickly when you get away from the bulb.
Brainerd, MN

April 10, 2007
6:11 PM

Post #3376767

For what it's worth to you, I just started rotating them, which means they are being cut from 16 to 12 hours of light per day in two shifts -- I don't know what else to do -- but because I'm trying this for the first time it may be a disaser. I'm just guessing 12 hours is better than no hoyrs (for the overflow).


Anne Arundel,, MD
(Zone 7b)

April 10, 2007
7:57 PM

Post #3377080

As to temperature- if it gets to freezing outside then start to worry about your greenhouse.. It will probably be warmer inside your greenhouse than out, though.

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