Kratky Greenhouse Bench and Shelving Buying Guide

Cucumbers growing in a small greenhouse, where a sturdy Kratky greenhouse bench holds containers

Choose a bench by weight first. A Kratky greenhouse bench holds containers of water, which are far heavier than pots of soil, so it needs a high weight rating, a material that won’t rot in damp air, and an open top so water drains and air moves.

In a small greenhouse, benches and shelves decide how much you can grow. They also change how warm or cool each container gets.

Weight Comes First

Water weighs about 8 pounds per gallon (1 kg per liter). A bench with six 3-gallon totes carries about 150 pounds of solution. Check the rating per shelf, not just for the whole unit, and leave a good margin. Heavy containers go on the lowest level.

Materials

Galvanized or powder-coated steel: strong and long-lasting. Look for a coating that won’t rust in humid air.
Aluminum: light, rust-free and common in greenhouse kits, but check the weight rating; some frames are lighter-duty.
Cedar or other rot-resistant wood: sturdy and easy to build to fit. It ages in damp conditions, so seal the cut ends.
Plastic shelving: cheap and rust-proof, but many units sag under water weight. Use it for seedlings and small jars only.

Slatted, Mesh or Solid Tops

Slatted or wire mesh: air moves through, spills drain, and light reaches the plants below. The best choice for most Kratky setups.
Solid: spreads weight evenly and stops drips onto the shelf below, but traps water. Add a slight slope or trays.

Height and Layout

Waist height for the main bench makes checking levels and roots easy.
Leave enough space above greens for them to grow, and much more for tomatoes or cucumbers, which may need to stand on the floor.
Keep a clear path so you can reach every container without lifting another.
Run benches along the sides and leave the center for tall plants, or the other way round in a narrow greenhouse.

Using the Space Under the Bench

The area under a bench is shaded and cooler, which is useful in summer: containers kept there stay cooler than those on top. In winter it is also the coldest spot, near the floor. Use it for containers in summer and for storage in winter. The summer greenhouse article covers cooling in more detail.

A Buying Checklist

Weight rating per shelf, well above your full containers.
Rust-proof or rot-resistant material.
Slatted or mesh top for drainage and airflow.
A height that fits your greenhouse and your crops.
Feet that sit level on your floor, or adjustable feet.

Common Mistakes

Buying light plastic shelving and watching it bow.
Putting the heaviest totes on the top shelf.
Filling every bit of floor, leaving nowhere for tall plants.

Common Questions

How strong does a greenhouse bench need to be for Kratky?

Strong enough for about 8 pounds per gallon of solution on each shelf, plus a good margin. Check the rating per shelf.

Is a slatted bench better for Kratky?

Usually, yes. Slats or mesh let air move and spills drain, and they keep the containers from sitting in water.

Can I put Kratky containers under the bench?

Yes, especially in summer, when the shade keeps them cooler. In winter that spot near the floor is the coldest.

Related guide: growing Kratky in a greenhouse.

What Is the Best Bench or Shelving for Kratky in a Small Greenhouse?