Tanks & Reservoirs

Reservoirs for mixing and storing feed by hand

If you're hand-watering rather than running a dosing system, a reservoir is where you mix a batch of feed before it goes anywhere near a plant — get the volume right and you can mix once and water a whole tent from it rather than jugging small amounts repeatedly. Our FlexiTank collapsible water butts (from £44.95) fold flat when empty and hold from 25L up to 400L depending on size, useful if storage space between waterings is tight.

Cold tap water straight onto roots slows uptake, especially in winter — a Hailea water heater (from £14.95) sitting in the reservoir brings feed up to root temperature before you water, which matters more than most growers expect for how fast a plant actually drinks.

Buying advice

Size the reservoir to how often you want to mix, not to your total plant count — a 100L flexi tank that lasts three waterings beats mixing 25L every other day. If you're building a dosed or recirculating system rather than hand-watering from a tank, that's a different setup — see tanks and reservoirs for hydroponic systems instead. Orders over £50 ship free UK-wide, or ring 020 3488 0419 if you want sizing checked first.