Collection: Plant Soaps & Wetting Agents

Make every spray work harder

Water beads up and rolls off a leaf. Dry compost repels water rather than absorbing it. Both are surface tension problems, and both are solved by the same thing: a few millilitres of surfactant in the tank. A garden wetting agent is the least glamorous product in the range and probably the one that changes the most about how everything else performs.

What is in the collection

• Natural Wetting Agent. A gentle surfactant made with organic soap nuts (saponins) and aloe vera. Handcrafted in Stockport. Goes into a spray tank, a watering can, or a root drench.
• Organic Plant Soap. A concentrated potassium soap, made from potassium-based fatty acids specifically for plants. Biodegradable, with no added fragrances, dyes, thickeners or detergents, for use as a regular hygienic plant wash. Handcrafted in Stockport.

Three jobs a wetting agent does

1. Foliar sprays. Water beads on glossy, waxy or hairy leaves and rolls straight off. A wetting agent for plants breaks the surface tension so the solution spreads into a thin, even film across the whole leaf. Same volume sprayed, considerably more of it staying where you put it.
2. Root drenches and liquid feeds. The same effect below ground. Solution penetrates evenly through the root ball instead of channelling past it down the sides of the pot.
3. Rewetting dry compost and soil. Peat-free and bark-based mixes become genuinely water-repellent once they dry out completely: water rolls off the surface, or runs straight through without soaking in. This is where a soil wetting agent earns its money. A small dose in the watering can breaks that repellency and lets the medium rehydrate properly. It is the use most people discover by accident and then never stop using. The full explanation of what is going on.

How to use plant soap

Dilute as directed on the product page and apply with a fine-mist sprayer to clean dust, residues and grime from foliage. Potassium soap also works as a wetting agent in its own right, so a small dose in a spray tank improves coverage of whatever else you are applying. Pairs cleanly with the liquid fertiliser range and the biostimulants.

Lawn with a dry patch the hose will not touch? That is hydrophobic soil, and it is exactly this problem at scale: how a wetting agent fixes it.

Common questions

What is a wetting agent, in plain terms?

A surfactant that lowers the surface tension of water so it spreads and soaks in rather than beading up. In the garden that means better spray coverage on leaves, more even penetration at the roots, and dry compost or soil that will actually take water again.

Are these safe on any plant?

On most, yes. Always test a small leaf area first. Ferns, succulents and freshly transplanted seedlings can react to surfactants.

When is the best time to spray?

Early morning or evening, out of direct sun. Avoid spraying above 25°C or in strong sunlight, which risks leaf scorch.

Can I add a wetting agent to my fertiliser?

Yes, and it is one of the main reasons to own one. It improves both foliar coverage and root-drench penetration. Dilution rates are on the product page.

My pots are not taking water any more. Will this help?

Yes. That is hydrophobic compost, and it is one of the primary uses. A few millilitres in the watering can lets water soak in rather than running off the surface or straight out the bottom.

Will it work on a dry patch in the lawn?

Yes. Dry patch on a lawn is usually hydrophobic soil rather than a feeding problem, and a soil wetting agent applied through a watering can or hose-end feeder is the direct fix. Spike or aerate the area first if the ground is also compacted.

How often should I wash leaves?

Whenever they need it. Visible dust, residue or grime is the cue. Plants grown under cover, or near radiators and fan vents, need it more often than anything outdoors.

What is the difference between the two?

The wetting agent is built for mixing into sprays and drenches to improve how they spread. The plant soap is built for washing foliage, though it improves spread too. If you are buying one to go in the tank, take the wetting agent.