The largest bag Barney's Farm makes, for outdoor and greenhouse plants given a full season to grow. This much medium lets a plant reach its genetic size instead of running out of root space in August. Breathable fabric drains heavy rain and keeps the root zone cooler than plastic through a hot summer.
The outdoor and greenhouse size
This is a container for a season that starts in spring and finishes in autumn, where a plant has five or six months to build a root system. It is also the answer where planting into the ground is not an option, on a roof, a patio, a greenhouse floor or rented land. Indoors it is more container than a tent needs, and the filled weight makes it impractical to work around.
How fabric handles rain and summer heat
Heavy rain drains through the walls and the base instead of pooling on a compacted surface, which is how container plants drown after a wet week. In heat, water evaporating through the fabric draws warmth out of the medium in the same way an unglazed terracotta pot stays cool, so the root zone runs several degrees below a black plastic container in the same sun. Roots stop working properly when the medium gets too warm, and that is where fabric earns its place outdoors.
113 litres, or roughly 4 cubic feet
That is a little over two standard 50 litre bags per pot. At this volume almost nobody buys finished potting mix, and building the medium from a base with compost, worm castings and amendments costs a fraction of the bagged equivalent for a better result.
Position it before you fill it
A filled and planted bag of this size cannot be moved, so the decision is made once. Choose a spot with sun for most of the day, shelter from strong wind, and ground that drains. Raise the bag on bricks or a pallet so run-off leaves freely and so roots do not grow out of the base into the soil underneath.
