With these small cheap greenhouses that are plastic covered and are good for propagating seeds and cuttings, this a good way to water your seed trays and pots without the real risk of drenching and getting droop and rot. Simply run a length of hosepipe up and down and leave a stub protruding out of the bottom. Attach a hose connecter to this stub. All you have to do then is prick the hosepipe a couple of times with a stout pin so the holes point inwards on each tray level. Secure the pipe to the frame with small cable ties or plant twists.
When you attach your main hosepipe from the tap to the protruding connecter, turn on the pressure and you will achieve a light misting over your seed trays on each level of the house. If the spray isn't strong enough, just open the hole up a little with a pin or nail or add more holes. If the direction isn't accurate, simply twist the pipe around until you get the right direction. Now ensure the pipe is secured well to the main frame and, bingo! You can water the whole house in minutes and not overwater.
You can use the same system in a normal greenhouse but beware that everything will get watered.
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