Soil Drench & Solution & Product per Plant

A soil drench pours a measured volume of fungicide or insecticide solution directly at the base of each plant so the chemical reaches the root zone and soil. It treats root and collar diseases — such as collar rot, root rot and wilt — and soil-dwelling pests that foliar sprays can't reach, because the active ingredient is delivered straight to where the problem lives.

Total solution = number of plants × mL of solution per plant. The product to add = total solution × the label rate per litre. For example 200 plants at 100 mL each is 20 litres of solution; at 2 mL of product per litre you mix in 40 mL of product. Enter your figures and the tool returns total solution, product, plants and mL per plant.

Enough to wet the root zone without flooding — commonly 50–250 mL for seedlings and small plants and up to 1–2 litres for established trees, depending on root spread and soil. Moist soil before drenching helps the solution move down rather than run off. Always follow the product label, which sets both the rate and the volume per plant.

It's the amount of formulated product the label tells you to mix into each litre of water — for example 2 mL/L or 1 g/L. The tool multiplies your total solution volume by this rate to give the total product needed. Never exceed the label rate: more product does not cure faster and can scorch roots or breach residue limits.

Drench when the target is in the soil or at the collar and crown — root rots, damping-off, collar rot, vine and stem-base diseases, and soil insects like grubs and root mealybugs. Foliar sprays suit leaf and shoot problems. Some systemic products are drenched so the plant takes them up through the roots and protects new growth.

Mix the product into the measured water, stir, and pour the per-plant volume slowly around the base so it soaks the root zone evenly. Pre-water dry soil first. Drench in the cooler part of the day, keep the volume consistent plant to plant, and avoid splashing foliage if the label warns against it. Re-treat only at the interval the label allows.

Used at the label rate it's targeted and generally safe for the crop. Over-strength solution, drenching dry or heat-stressed plants, or repeating too often can injure roots, harm beneficial soil life and leave residues. Sticking to the calculated product amount and the labelled interval keeps the treatment effective without damaging the root zone.

Yes — the maths is the same whether you drench nursery pots, raised beds or field plants. Just count the plants and set a per-plant volume that suits their size and root spread. For large blocks, work in batches so the mixed solution is used promptly and the concentration stays even across every plant.

They're accurate for the volumes you enter — the calculation itself is exact. Real-world results depend on soil moisture, how evenly you pour, plant size and the product. Treat the totals as your mixing target, measure the product carefully, and follow the label for rate, volume and timing.