Aptus StartBoost Humic Acid Plant Additive, 1 L

Help Roots Grab Hold of Every Nutrient You're Already Feeding

A feeding program is only as effective as the roots' ability to take up what's in it — and early in a cycle, that uptake capacity is exactly what's still developing.

StartBoost, a foundation product of the Aptus Premium Collection alongside Fasilitor, is built from humic acid derived from leonardite, a natural source mined from the earth and filled with long-chain carbon-based molecules that chelate elements from the soil.

That chelating action can increase the uptake of micronutrients — which is why StartBoost is the primary additive Aptus recommends through the vegetative phase and into the first week of flowering, then set aside as the plant's needs shift.

Key Features & Benefits

• Humic acid derived from leonardite — supplies a natural, earth-mined source of long-chain carbon-based molecules.
• Chelates elements from the soil — may increase the uptake of micronutrients already present in your feeding program.
• Primary vegetative-phase additive — is the main Aptus additive used through vegetative growth and the first week of flowering.
• Doubles as a seedling and clone drench — can be used alone at a lighter rate for dedicated seedling or rooted-clone applications.
• Works as a transplant root dip — diluted at 1:100, it supports rooted cuttings being transplanted into new media.
• Sized from 1 to 20 liters — lets growers match the bottle to their reservoir setup and dosing schedule.

Who Should Use Aptus StartBoost

Growers who want to support root development and micronutrient uptake during the vegetative phase — whether feeding a reservoir, drenching seedlings and clones, or dipping roots before transplanting — with the 1 L size matched to that dosing schedule.

Dosing StartBoost Through Early Growth

Use StartBoost through the entire vegetative phase and week 1 of flowering at 1 ml per gallon; use it alone at 1 ml per liter as a dedicated seedling or rooted-clone drench, or diluted 1:100 (10 ml per liter) as a root dip for transplanting rooted cuttings. Aptus recommends discontinuing use after week 1 of flowering.

Frequently Asked Questions

When should I stop using StartBoost?

Aptus recommends using StartBoost through the entire vegetative phase and into week 1 of flowering, then discontinuing it as the plant's nutrient needs shift toward bloom.

Can StartBoost be used as a clone or seedling drench?

Yes — used alone at 1 ml per liter, it can serve as a dedicated drench for seedlings or rooted clones.

How do I use StartBoost for transplanting?

Dilute it at a 1:100 ratio (10 ml per liter) for a root-dip solution when transplanting rooted cuttings into new media.

Does StartBoost replace a base nutrient program?

No — it's a foundation additive that complements a base feeding program, supporting root development and micronutrient uptake during the vegetative phase.