Watering is one of the most tedious tasks with greenhouse gardening, as these types of indoor gardens require much more water. Watering your greenhouse improperly could cause you to lose your crops. This article will help you to learn ways to make your daily chore much easier while fabulously reaping the benefits.
When To Water
It’s always best to water your plants in the evening, rather than during the hot daytime hours.
Plants made up of soil-less composts, need more water because they get dry more quickly.
The best way to kill your plants is to water them simply out of routine of doing it. Make sure not to over-water them, but at the same time, assure that they have the amount of moisture that they need.
Larger and more mature plants need more water than young new plants. Take care to take the proper measures to water them accordingly. When your older plants start drooping, it may be time to take out the watering can!
The plants in your greenhouse will require less water during the dormant season of the coldest weather usually in December and January.
Keeping the floor wet in your greenhouse in the very hot summer days, will help to keep moisture in the air for your crops.
Hand-Watering
At times it may be hard to predict the amount of moisture that is in a plant pot, especially if it has a lot of peat-based compost. Try pressing your fingers gently into the top of the soil mixture inside of the pot.
Another way to guess the level of moisture is to use moisture indicators in a few select pots.
Larger plants that have been established for some time will benefit most with less forceful watering. This can be accomplished by breaking the force of the water dispersing from the watering can. Sometimes a small piece of cloth will do the trick. Small seeds definitely need to be watered with a very gentle spray. This can be done by pointing the rose of the watering can in an upward motion.
Hand-watering is still the most dominant method of greenhouse garden irrigation, even in today’s competitive markets. After frequent crop losses however, many growers are realizing that it may be time to change their traditional ways.
Overhead Spraying
Many of us prefer to have a spray mechanism when watering the greenhouse garden. It is possible to purchase several different designs of tubing that can be suspended overhead from the roof of your greenhouse. Some water spraying systems will spray in two-sided directions; others will spray water to only one side. You will have to select the type of tube design that you need and prefer.
Improvising
Although it is possible to buy specially designed systems with reservoirs, you can improvise to save money. This way works wonderfully. Find a lengthy piece of plastic gutter and use it as a reservoir by inserting one end of the capillary mat. Capillary mats allow the plants to be watered from the base of the container, where the capillary action of the compost takes place. Just sit your plants on top of the mat. The gutter should be always filled with water. You can do this by hand-watering it or by creating a drip system with the simple use of water bags.
Simple drip water system kits can be purchased with minimal cost for those that would prefer this method. These kits include usually about six drip valves that can be synchronized. Some kits even have adjustable water and fertilizer flow.
You can also pick up a combination of mist-like sprayers and adjustable dripper kits.
It is often best to have automatic watering systems that can do the job when the owner or part-time hobbyist is away at work or away even for short periods of time. Timers or automatic sensors can be applied to help as well with this task.
Allow me to share this quotation:
The most noteworthy thing about gardeners is that they are always optimistic, always enterprising, and never satisfied. They always look forward to doing something better than they have ever done before. Vita Sackville-West
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{ 4 comments… read them below or add one }
how much water does a typical greenhouse need per square meter of crop grown?
I just want to get an idea of how much more intensively a greenhouse water use is compared to growing the crop outdoors. Ideally I am looking for examples from greenhouses located in the northwest pacific region or at least in canada. Any help with this will be much appreciated!
as a civil engineer we study crops, yes, odd, but we do so we can plan infrestructure. To be honest, I don’t know much about greenhouses, but I can tell you, that you have to be more specific on the area where you’ll be growing, and what type of crop. The type of crop is crucial, since it depends on what plant or plants will you have, to be abble to calculate the amount of water needed.
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it also depends on some other factors like climate, nature of soil, which plants u r talking about & inner climate of that green house, this is a matter of further study & research in this imp. subject. thanks for asking.
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The first two answers are correct. However there is something that can be said even without more specific information.
I grow orchids in a greenhouse in California.
Greenhouses located in the areas you mention especially will require quite a bit more water than if the crop were planted outdoors. The reason is threefold.
1) The interior of the greenhouse will be significantly warmer than the outdoors. Water will evaporate faster the warmer it is.
2) The humidity inside the greenhouse will be lower than outdoors. That will also increase the amount of evaporation.
3) It is a good idea to have a fan to circulate air in the greenhouse. The fan should run continuously or at the very least in the daytime. It will reduce pests and plant diseases, however moving air will also increase evaporation.
The relative humidity in a greenhouse can get quite low even in an area with high outdoor humidity. That can be a problem for plants and can encourage some kinds of pests and may need to be offset by using a mister, but as I note below avoid a very high humidity.
Evaporation can be suppressed by maintaining a high humidity using a mister for instance inside the greenhouse but that can be a bad idea if the humidity is much above about 50%. High humidity will encourage plant diseases. Also at night when the temperature falls the humidity will reach 100% causing dripping onto the plants, which also causes disease.
While I cannot say with precision how much more water you will need in a greenhouse, it will be more and will probably be more than twice as much.
One final note about greenhouses. Avoid temperatures above 95F. For most plants photosynthesis shuts down above that temperature, which will stunt the growth of your plants. Your greenhouse will need vents at least that can be opened and closed, preferably automatically to reduce temperature and may need active cooling using fans or a swamp cooler.
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