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Wicking Bed for the Greenhouse

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The DIY wicking bed for the greenhouse is a great self watering raised bed. Filled with good soil mix it waters the plants from the bottom up.

We are in the fourth year of garage greenhouse growing where we grow food year round. You can read more about it here.

A very important part of a greenhouse is the soil to grow plants in. Since a garage greenhouse, or any other indoor greenhouse, has no soil, we had to come up with a good alternative solution.

First we sewed some grow bags. The first year growing in the grow bags was challenging since we had not figured out a good watering system yet. Plus, we didn’t think that the grow bags filled the space well. So we transferred the grow bags into our driveway and they worked great there.  See how to grow in grow bags.

Next we tried hydroponic growing. We built a great mist aeroponics grow box. We haven’t shared much about it here as we were still not sure about that system. Technically it should work great, practically it didn’t  yet.

Anyway, after some consideration, we decided to try a wicking bed.

What is a wicking bed

The DIY wicking bed in the greenhouse is a great solution for a self watering raised bed. Filled with good soil mix it waters the plants from the bottom up. A wicking bed can be indoors or outdoors. You can build it as small as a square foot or as big as you want it to be. It has a waterproof lining that holds a reservoir of water at the bottom from which water is drawn upwards like a wick to the surface of the bed, through soil or roots of the plants in the bed. Wicking beds are great for container gardening and for no till gardening.

How to build a wicking bed

How to build a wicking bed

The core elements of a wicking bed is a raised bed that either is water proof or has a waterproof liner. It also needs an overflow pipe about 8 inches from the bottom, and a watering inlet with holes at the the bottom to fill the bed with water. In a bigger bed you want to use scoria, gravel, or rocks; in a smaller container you can use a pot or two. Cover the scoria with weed control or shade fabric. Now fill the bed with good soil mix. We recommend Mel’s Mix from the All New Square Foot Gardening book.

Our wicking bed

We build the wicking bed for year round growing in a cold climate, therefore we insulated it with Styrofoam first.

Hydroponics box

Update: We used construction plastic (See picture below) to line our bed, it did not hold and started leaking. We had to take out the bed. Use pond liner instead (See picture above), it is more durable and will hold for many years.

A Wicking Bed for the Garage Greenhouse

We used rocks from a farmer’s field. Those were free and worked well.

A Wicking Bed for the Garage Greenhouse

Next came the weed control fabric to make a barrier between the rocks and the soil.

A Wicking Bed filled with Mells mix.

The most important part of a garden bed is the soil. We mixed Mel’s Mix from the All New Square Foot Gardening book. Mixing together: 1/3 compost, 1/3 vermiculite, 1/3 peat moss.

Mel’s Mix is a very light and rich soil. It keeps the moisture and is great to work with. There we go, the wicking bed is ready to grow tomatoes.

Wicking bed ready to be planted

What are your experiences with wicking beds? Please share in the comments below.

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Filed Under: Container Gardening, Gardening, Growing, Soil Preparation Tagged With: Container Gardening, Gardening, Greenhouse

Reader Interactions

Comments

  1. Sheri Cline - WA. State Zone 8b says

    at

    I’ve used wicking garden pots but not garden beds. The only thing I noticed with the pots is that from time to time they need a flush-out. The water tends to get sour.

    Reply
    • Anna says

      at

      Great tip Sheri, this is good to know, thank you for sharing.

      Reply
  2. Lisa says

    at

    Thank you for sharing! What type of poly/plastic did you use? I wanted to be sure the bed I’m creating isn’t using toxic plastic…

    Reply
    • Anna says

      at

      Hi Lisa, I need to update the post. Do not use plastic, it does not hold and starts leaking. We just took out the bed. Use pound liner, that is more durable. Hope this helps.

      Reply

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Jakob und Anna winter 2Northern Homestead is a blog about urban homesteading in a cold climate. We write about growing, raising, preserving, and preparing our own real food.
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