Greenhouse

Lorena Gorsche via pbs pbs@lists.pacificbulbsociety.net
Fri, 08 Jan 2021 09:10:49 PST
Lovely, I had a 12 X 8 Santa Barbara green house in Santa Clara Ca. I found my shade area 6 X 15 was better for growing because of the ventilation. Totally agree, windows are the key. Additionally clear glass as I must be able to see outside while in the green house. 
Thank you for tips,

Lorena now in PNW Oregon.

> On Jan 8, 2021, at 8:53 AM, Pamela Harlow via pbs <pbs@lists.pacificbulbsociety.net> wrote:
> 
> ´╗┐This has been a fascinating thread.  Perhaps the biggest lesson is to
> understand the climate and site particulars where the greenhouse will be
> used, as well as the requirements of the desired plants.  Regional
> greenhouse users and suppliers can help with this.
> 
> A practical means of mouse-proofing the floor is via heavy landscape
> fabric.  I used treated lumber for the foundation.  This enabled me to
> staple the fabric to the wood all around the periphery, carefully smoothing
> ripples and folds.  It can be done.  I hand-sewed the overlapping floor
> strips together.  The only problem with a fabric floor is that silt can
> eventually plug the fabric weave, slowing drainage.  Heavy treatment with a
> shop vac when the floor is dry will help.
> 
> I concur that no greenhouse is large enough!  However, careful bench design
> can maximize plant space, especially if the greenhouse has some width to
> work with.  But, that would be another thread!
> 
> Pamela
> 
>> On Fri, Jan 8, 2021 at 8:17 AM Johannes-Ulrich Urban via pbs <
>> pbs@lists.pacificbulbsociety.net> wrote:
>> 
>> Hello Luminita,
>> 
>> There are so many excellent comments on greenhouses, here is my personal
>> experience.
>> 
>> I am on my fourth greenhouse here in Portugal and I would recommend the
>> following: as much ventilation as possible. Many comments have stated that,
>> it cannot be overdone. I noticed that some of the models in the attached
>> catalogue do not have enough windows or louvres. Do order as many extra
>> ones as possible! I prefer widows because louvres are not closing tight
>> enough when it comes to heating, otherwise they are fine as you can direct
>> the air flow. I use non electric automatic openers, very reliable.
>> Shading: try to get a structure for (removable) shade cloth on top of the
>> structure which bears the glass. If there is a space between shade cloth
>> and glass which allows air to circulate, shading will be more efficient
>> than with shade cloth lying directly on the glass. This is my problem right
>> now. This space has to be big enough to allow the windows in the roof to
>> open fully. At the same time such an extra structure is a perfect
>> protection against hail damage.
>> If the shading is removable in winter you gain a lot of light and warmth.
>> The door: try to choose a model which is tall enough so that the door can
>> be put anywhere. This gives you a lot of flexibility. Make sure the door is
>> wide if you need to move large plants, bulky material or a wheelbarrow.
>> Mice: make it mouse proof from the beginning. Stand the frame on  a floor
>> of slabs or make a concrete or wall foundation deep enough to stop mice
>> from digging underneath.
>> Choice of glass: take greatest care which material you choose. Classic
>> single pane glass, double glass (very good insulation but EXTREMELY heavy
>> to manipulate) acrylic glass or polycarbonate glass and also horticultural
>> films. All these materials have their own advantage and disadvantage and,
>> very important, all have different properties when it comes to light
>> transmission. I lost an entire winter growing Oxalis collection when it was
>> moved from a greenhouse with acrylic glass in the roof to another one which
>> had triple glass required by the local building authorities. The triple
>> glass in the roof absorbed so much of the light spectrum (unnoticed by the
>> human eye) that the Oxalis dwindled away within two or three years. There
>> are high tech professional horticultural films with almost 100 percent
>> light and spectrum transmission. It all depends on what you want to grow
>> and at which season you want to use your greenhouse.
>> 
>> And last but not least...... I can only confirm that a greenhouse should
>> be as big as ever possible...... not only for space reasons but also
>> because it becomes the easier to manage temperature wise the bigger it is.
>> It will be the place in your garden where you will spend most of your
>> time....
>> 
>> I am also more than happy to answer more questions.
>> 
>> Happy planning!
>> 
>> Uli
>> 
>> Please find attached a picture of my current greenhouse. Note that the
>> walls are high enough so that the door could be anywhere. And note that the
>> shade cloth is directly on the glass which is a compromise. The walls will
>> be painted with white reflecting paint in summer. And yes, there are not
>> enough windows..... 5 in the roof and 4 in the walls.
>> 
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