The smallest bag in the Barney's Farm range, sized for a single plant in a 2x2 tent, on a balcony or on a windowsill. The fabric wall air-prunes the roots as they reach it, which builds a dense root mass instead of the tangled circle a plastic pot produces. Reinforced carry handles, and the gold Barney's Farm sun printed on the front.
Five gallons holds enough medium to carry an autoflower through its entire life, or a photoperiod plant kept short with a two to three week vegetative period. Thirty centimetres across is the largest diameter that still leaves working space in a 2x2 tent. Growers running a sea of green with four or more small plants use this size for the same reason, since each plant needs its own root volume rather than more floor space.
Air pruning replaces root circling
In a plastic pot a root reaches the wall, turns, and keeps growing in a circle until the container is a solid mass of root and the plant stops taking up water properly. In fabric the root tip meets dry air at the wall and stops there, and the plant responds by pushing out side roots behind it. The result is a fibrous root system spread evenly through the whole volume rather than a shell wrapped around the outside.
17.7 litres, or roughly 0.6 cubic feet
One standard 50 litre bag of potting mix fills close to three of these. Fill to about two centimetres below the rim so water has somewhere to sit while it soaks in, and expect the level to drop slightly after the first few waterings as the medium settles.
Watering is judged by weight, not by the surfaceFabric loses moisture through the sides as well as the top, so a 5 gallon bag under a strong light in late flower can want water every day. The surface dries long before the root zone does, which makes it a poor guide. Lift the bag instead. The difference between a watered bag and one that is ready for water is obvious in the hand within a couple of grows.
The smallest bag in the Barney's Farm range, sized for a single plant in a 2x2 tent, on a balcony or on a windowsill. The fabric wall air-prunes the roots as they reach it, which builds a dense root mass instead of the tangled circle a plastic pot produces. Reinforced carry handles, and the gold Barney's Farm sun printed on the front.
