7

Yes, the colour will block some light, but not too much. The only reason they sell these green plastic coverings on a frame is because they're thought to be more aesthetically pleasing than looking at clear plastic, and because the material they're made from is somewhat tougher than clear plastic.


7

4mm twinwall polycarbonate is the best choice, for reasons which I'll explain. Where you live in Edinburgh, Scotland, the days are shorter and the light less bright - 4mm twinwall polycarbonate allows 80-84% light through, compared to single wall polycarbonate, which allows 94-96% (note that 3mm glass allows 97-98% light). This might sound like a big ...


6

The answer is the one I hate the most: it depends... Factors influencing your decision include: aesthetics: glass looks better than plastic if you are putting a greenhouse close to your house local climate: if it gets cold where you are then the material best suited for the snow load and that provides the most heat retention will be a better choice even if ...


6

It depends on your environment and how much light is blocked. Basically opaque plastic might even let 70-90% of light true even though you can't see through it. This depends highly on the plastic. If you're in lowlight environment then that would be bad but if you're in environment where you have enough or too much light then this should not cause problems. ...


6

Plants grown warm, indoors, will need hardening off to transition to an outdoor greenhouse that's unheated. One aspect you may not have considered with a "simple greenhouse" is cooking the plants on a bright, sunny day - an unventilated greenhouse can become a solar oven. There are unpowered wax-based automatic vents, or else you need a person on the job ...


6

Adding to @Ecnerwal excellent answer - Draped row covers will provide a little additional support by trapping in more heat - maybe 1-3 degrees c - the key would be to take them off during the day to help heat the soil beneath them. If you look at what hardiness zones plants can be grown in and when you can plant them, that should give you an indication as ...


6

Will the pepper grow back? Not exactly. However, after you harvest the pepper the plant likely will produce more flowers, which can be pollinated and grow into more peppers.


6

You could do this, and it could indeed strengthen the remaining fruits - another option may be to encourage the plant to grow back downwards.


5

The UV stability of PVC aside I chose to use a roll of clear weather sealing tape from Frost King. This is used to seal windows which means it's not going to react with the greenhouse plastic I'm using. I've applied it to the top of all the hoops and will see how it fairs over the winter compared to last year without it. This is the roll I picked up Update ...


5

Yes, you absolutely want to have drainage. Roots need moisture but they need oxygen too and poor drainage is going to likely result in roots that rot and plants that die. Not sure exactly how your beds are made but you could drill some holes in the bottom and then put some PVC drain ports in the bottom to allow for drainage while protecting the wood. (I'm ...


5

Several of the answers here are incorrect. Green plastic absorbs green light or reflects it which is why it appears green. Green is chosen because if you want to reduce the light intensity to the inside of the greenhouse, you use green because it's not used by the plants to any significant degree. The filtering is not perfect which is why you might still ...


5

I received an answer from an OGrow representative. OGrow is a manufacturer of greenhouses. Me: Can we get an official response on how to choose between the green and clear coverings? I'm mainly going to grow fruit trees and shrubs. Would fruit trees do better with the clear covering because bit provides full sun? OGrow: While we cannot ...


5

White up reflects more light to the plants, and keeps the soil cooler (from sun) probably also keeps fuel-based heat in the soil better if the ground was what was being heated in the commercial hothouses. If the air was being heated, makes little difference. Black up warms the soil more effectively from sun. Either should block most weed growth under them. ...


5

No, it will not grow back. The pepper is the result of a pollinated flower, as is a peach, an apple, a tomato, etc. However, save some of the seeds inside the pepper and you can plant them to have a new plant that will flower and will produce more bell peppers once they are pollinated by your local flying insect helper (e.g., a bee). Since you have a ...


5

If the plants apparently have never (or not for a while) been exposed to strong sun and wind, I would definitively recommend hardening them off or shielding them a bit: If the plants look basically robust, e.g. if you suspect they have been bought by the nursery from another supplier that grew them outside, leaving them outside in dappled shade and with ...


5

It depends somewhat on "WHAT" the inside/outside properties are. If they include an "anti-drip" or AD coating, that should be on the inside, and you might be able to see that water beads up less and runs off more easily on that side of the plastic if you spray a bit on from a plant mister. The main problem (AIUII) with having it inside out is that the UV ...


5

Growing plants in different climate zones can be a challenge. For people in warm climates. The first thing you need to do is make a plan. And research the climate your plant grows in likes. At our greenhouse, we use an aquarium and pump ice water through a trough that allows the plants we are growing to have the correct root temperatures.


5

With greenhouse plastic there are some issues to keep in mind. First, if you are considering a longer term installation then UV light will quickly shatter regular plastic. UV resistant plastics are available. Even then your max lifetime is about 4 years. The second issue is abrasion. With expansion and contraction of the plastic sheet the plastic cover is ...


4

Your plants need the UV light, so blocking 99% of it will be too much. You should stay at around 50-60%.


4

Green filters, such as the green colored plastic, allows more green light than other wavelengths to pass through. For plants, the blue and red part of the spectrum are the most important. Since plant leaves are generally green, they reflect green light. I don't think the green color would be the best choice to grow plants under. I'm pretty sure a green ...


4

Green filters, such as the green colored plastic, allows more green light than other wavelengths to pass through. For plants, the blue and red part of the spectrum are the most important. Since plant leaves are generally green, they reflect green light. I don't think the green color would be the best choice to grow plants under. Red would probably be better....


4

While looking for an answer to this question myself, I came across this article which talks about actual studies that have been done regarding the colour of plastic greenhouse covers. In particular it states: In studies, it has been found that using green plastic to cover a greenhouse results in plants which are slightly (but very slightly) shorter than ...


4

Just like double paned, insulated glass, different thicknesses provide different R-Values. Manufacturers/retails will sometimes list the R-value for their products. Here you can find some R-Values for twinwall. The greater the thickness, the more effective it is as an insulator. Determining which thickness to get will be based on your climate, what you plan ...


4

Quite a bit of stuff actually, even in Scotland, but a lot of it will need to be sown inside or somewhere heated at this time of year up there, it being that much cooler than us here in London. Also, some vegetable crops can be germinated and started into growth now, but will simply sit, protected, in the greenhouse, until spring, when the weather warms up ...


4

Even if you cannot heat your greenhouse, there is a lot you can do to prevent freezing. On the other hand, though, there is a point after which effort is useless without a heat source. If it is just "pop" freezes, as you call them, and not generally not going below for more than a couple hours, there are several ideas you might like to try: Frost Patrol® ...


4

I would take expert advice from a boiler person/heating installer, frankly - the steam condensate produced by these boilers contains nitrites.which are produced by the gas burning process. The pipe carrying the steam outdoors (I assume you had yours fitted more than 2 years ago) is prone to freezing in very cold weather, and if the condensate flows over a ...


4

If you're googling how to grow microgreens in a greenhouse, you will likely get a lot of sales and information of the type you're complaining about, or information aimed at large professional growers. The other problem you might have is that any 'controlled conditions' mentioned as suitable for this type of crop may not be the same conditions created for ...


4

Each pane of glass will reduce the number of lumens coming in which means less light for your plants, which as close to the arctic circle as you will be will starve your plants for light during the winter months. I would opt for double glazing, take the savings from that and invest in a high quality wood stove that will allow you to keep the glass house ...


4

more light = more growth, although I'd imagine if you are growing this for personal edification rather then produce yield, this will be much less of a factor. If I understand the Light value of 62 to mean 62%, this figure does seem very to me to be very much on the low side - I'd have expected figures > 80%. I suspect you are aware that light has ...


4

First of all, I want to caution you regarding the amount of humidity a grow room is going to produce, especially if it's heated. Depending on what your walls are made out of, the humidity may eventually damage them or encourage mold on them. So, make sure that's accounted for. I've had a problem similar to that before, but you probably have more light in the ...


Only top voted, non community-wiki answers of a minimum length are eligible