How to Water Greenhouses


Proper watering technique in your greenhouse will lower the amount of water used, decrease the spread of disease and maintain healthy plants. Using the correct tools for the job and taking the time to water properly will make for a successful greenhouse experience. Purchase a good quality lightweight hose and an adjustable watering tip. Wear rubber shoes for both safety and convenience. If your greenhouse has hanging baskets, it helps to wear a hat. Water thoroughly and let the soil dry before watering again.

Watering The Greenhouse Plants

Step 1

Walk through the greenhouse and remove dead leaf matter or prune diseased plant parts. Dispose of the plant matter. Check plants as you go to make sure they need water. The University of Maryland recommends looking for signs of too much water, such as root damage or excessive growth; and signs of too little water, such as wilting and leaf burn. Sanitize the pruning shears in a solution of 1 part bleach and 10 parts water. Wipe the shears dry and replace into storage.

Step 2

Attach the hose to the water supply using a quick release coupler. Uncoil the hose to its full length and lay it along one side of the greenhouse floor. Attach the sprayer wand. Set the sprayer for the correct pressure nozzle needed for your first watering stop. Make sure the valve is set so the water is shut off at the sprayer nozzle. Turn the water on at the water hydrant.

Step 3

Water the larger seedlings, annuals, perennials, houseplants and baskets. Use a nozzle setting that provides a wide spray, but not too much pressure. Cactus and succulents do not require much water. Make your way down one side of the greenhouse and back up the other side. Use the shut off valve on the spray wand. Shut the water off at the hydrant. Open the valve on the spray wand to let the pressure out. Remove the hose from the hydrant, coil and store.

Step 4

The University of Maryland describes mat watering. Going away for a day? Place a polyethylene sheet on the bench and add a ½ inch thick moist mat on top. Arrange houseplants and older seedlings or annuals on the mat in pots with bottom holes. The plants will take up the moisture through a capillary action.

Tips and Warnings

  • Be aware of your footing in a greenhouse. Wet floors and wet hoses are slippery

Things You'll Need

  • Hose
  • Adjustable spraying wand
  • Hose coupler
  • Rubber shoes
  • Hat
  • Pruning shears
  • Jar with one part bleach to 10 parts water
  • Polyethylene sheet the same size as your greenhouse bench
  • 1/2 inch thick moist mat


  • University of Maryland: Methods of Watering Greenhouse Crops
Keywords: watering plants, greehouse techniques, irrigation

About this Author

Cheryl Swayne is a writer and farrier based in Kansas. Her articles have appeared in publications including "Kansas Wildlife and Parks Magazine." She worked in national and state parks for 20 years. Swayne authored the nonfiction book "Wildflowers and Forbs of Sandhills State Park." She holds a Master of Science in business management from Baker University.