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Question for Darrell: Greenhouses in short light-season climates  RSS feed

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Great to have you on the forum. The book has been on my to-buy list since the folks at Milkwood in NZ referenced it a year or so ago.

I'm a Seattle resident with a great spot for a relatively small greenhouse (probably 8X12 or so) in my yard. It gets good solar exposure, and I plan to build a rocket mass heater to boost the ground and air temp.

But Seattle is a cloudy city, and all the estimates I've read for climate change, while positive for temps and rainfall in our maritime climate, seem to suggest that things will just get more cloudy as time goes on. So, my question is, what, if any, are the options for increasing the amount of light available to my plants? I'm interested in growing some semi-hardy sub tropicals, like feijoa, kaffir lime, and maybe a calamondin, and galangal along with starts and cuttings for the garden. I'm up for reflective walls, or even grow lights. Or, does that even make sense? Maybe I should stick with low hoops on raised beds to grow more kale?

Any suggestions from you, or other folks would be welcome.

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i am not sure you can increase sunlight in a greenhouse necessarily, without supplemental light. What you do want to do is use glazing that allows the highest amount of light in and maximize glazed area. it is better to let in more light and supplement heat, rather than to over insulate and lose light
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