Primo HG Turf Growth Regulator

Primo HG is an effective and trusted turf growth regulator, offering convenient application and consistently good results, including slowed vertical growth, improved lateral growth and turf density, and greener, more resilient turf overall. Because Primo HG does not contain any petroleum solvents, it has minimal odour and is easy and stress-free to use.

Primo HG can be used on a wide range of established lawns and turf grasses, including those on residential properties. It can also be used year-round as long as there is active turf growth, which presents a key benefit for many users.

Active ingredient: Trinexapac-ethyl @ 120g/L

Comparable to: Primo Maxx II Turf Growth Regulator (Syngenta)

Pack sizes: 500mL only (for 5L packs, see Primo Maxx II Turf Growth Regulator)

Registrant: Syngenta Australia Pty Ltd (APVMA #54275)

Click For Technical Info & Tips For Use

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Quantity	Discount	Status
2 or more	$69.00 each	Available

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Description

How does Primo HG work to regulate growth?

Primo HG (Home Garden) works by blocking the production of gibberellic acid within the plant leaf, effectively limiting cell elongation and curbing vertical growth. By shortening the distance between the shoot nodes, treated areas will see shorter, more upright turf growth, which consequently allows for better use of the plant’s energy.

When Primo HG is first applied, it is rapidly absorbed into the plant via its leaves. It quickly moves through the plant and begins to suppress growth, an effect that can last for up to 6weeks.

Using a growth regulator not only reduces vertical growth, but it also supplements lateral growth and better root development, which leads to a fuller, denser lawn that looks lush rather than overgrown. This is integral for plant health and root zone stability.

Why use Primo HG Turf Growth Regulator?

Many people choose to use Primo HG to promote greener, denser, more resilient turf with less growth, fewer clippings and, therefore, less expensive maintenance. Primo HG is the only turf growth regulator registered for home use in Australia.

Using Primo HG to regulate growth also has an array of flow-on benefits to the turfgrass, improving its water usage, colour, phytochemical efficiency, rooting, and ability to maintain quality under stressful conditions like drought, heat, and shade.

It’s particularly useful when treating lawns ahead of hot summers that can be stressful for the turf. When Primo HG is applied, the treated turf will form a deeper and more robust root system, which leads to better tolerance to heat, less wear and tear, and increased tolerance to pests and diseases.

Which turf species can Primo HG be used on?

It can be used on several different species of turf commonly found and used in Australia, including:

Warm-season grasses

Bahia grass
Buffalo grass
Carpet grass
Common couch (green)
Couch hybrids and varieties (eg Greenlees Park, Santa Ann & Wintergreen)
Kikuyu

Cool-season grasses

Bent grass (Agrostis Capillaris)
Fescue
Perennial ryegrass

Primo HG Turf Growth Regulator Key Message

Primo HG Turf Growth Regulator - in action Kikuyu

Primo HG Turf Growth Regulator - in action Couch

Features & Benefits

Primo HG, formulated with trinexapac-ethyl, offers the following benefits to users:

The only Trinexapac-ethyl turf growth regulator registered for home use in Australia.
Curbs turf growth to a more manageable level.
Promotes greener, denser turf.
Lessens the need for mowing and minimises clippings.
Significantly reduces maintenance costs.
Improves turf’s tolerance to environmental conditions like shade and drought.
Encourages more efficient water usage.
Leads to better turf rooting over time.

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Directions Of Use

Click here for Primo HG Turf Growth Regulator directions for use

Grass/Situation

Established Lawns

and Turf Grass

Rate

Application Comments

Buffalo grass, Common couch,
Hybrid couch, eg Greenlees Park,
Santa Ann, Wintergreen

Use 10-40mL per 10L of

water and spray over 100m²

Foliar Applied

See Critical Comments

Kikuyu

Use 20-80mL per 10L of

water and spray over 100m²

Foliar Applied

See Critical Comments

Fescue grass, Perennial rye grass

Use 20-60mL per 10L of

water and spray over 100m²

Foliar Applied

See Critical Comments

Carpet grass, Bent grass, Bahia grass

Use 20-40mL per 10L of

water and spray over 100m²

Foliar Applied

See Critical Comments

Winter grass reduction (in Bent grass)

Use 4-10mL per 10L of

water and spray over 100m²

Foliar Applied

See Critical Comments

Critical Comments – Buffalo grass, Common couch, Hybrid couch, eg Greenlees Park, Santa Ann, Wintergreen, Kikuyu, Fescue grass, Perennial rye grass, Carpet grass, Bent grass & Bahia grass

For best results, apply Primo HG when lawns are actively growing, well-maintained and receive regular water and fertiliser applications.
Use the lower rates when grass growth is moderate.
Use higher rates when grass growth is vigorous or when more extended periods of 4 to 6 weeks of regulation are required.
Repeat applications can be made as soon as turf resumes growth or if more suppression is required.
Apply as part of a program to maintain ongoing regulation of growth.

Critical Comments – Winter grass reduction (in Bent grass)

Winter Grass Management in Bent Grass.

Apply during peak growth periods. Low rates of Primo HG can provide growth suppression of Winter Grass, but not Bent Grass.
This can enable a transition towards a higher percentage of Bent grass.

How to prepare Primo HG

Before opening, shake the Primo HG bottle well.
Add half the required amount of water to your sprayer.
Add the required quantity of Primo HG to the half-full sprayer.
Add the remaining water required and ensure it is closed before shaking the sprayer.
Only mix sufficient chemical to be used on the day of mixing for the application area.

How to apply Primo HG

For best results, do not mow 6 hours before or after application.
Measure the lawn area before application to determine the size.
Make up only enough mixture to apply over the area.
Evenly spray the mixed solution over the area to be treated.
Thoroughly clean all equipment after application.
Empty and thoroughly rinse the sprayer with clean water.
For more information regarding the application, visit www.syngentaturf.com.au

Rates are a general guide only. Before opening, carefully read directions for use, precautionary and protection statements, storage and disposal, safety directions and first aid instructions. The product is designed for the particular purpose indicated on the label. Failure to use the product strictly as directed may be illegal and dangerous, and render the product ineffective.

Questions and answers from customers

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Disclaimer: This information and product advice is not intended to be advice or recommendations for any specific use or circumstance. You should seek specialist advice before using any product. Always follow the manufacturer’s guidelines. Specialist Sales liability is limited.

Host & Pest

Host	Pest
Host & Pest
Lawns and General Grassed Areas	Bent Grass - Agrostis Capillaris, Buffalo Grass, Carpet Grass, Common Couch, Fescue, Hybrid Couch, Kikuyu Grass, Perennial Ryegrass

Tips For Use

Constraints when using Primo HG

Do not apply to lawns or turf recovering from wear, renovation or turf affected by disease, waterlogging or other stresses (including turf going in or out of dormancy).
Do not use where growth regulatory effects are likely following the application of a fungicide or any other material.
Do not apply if rainfall is expected within 1 hour.
Do not water or irrigate lawns or turf for at least 1 hour after application.
Do not apply to Kentucky Bluegrass, as damage may occur

Clean Up

Wash out spraying equipment, mixing, and measuring utensils with water onto the grass.

Caution

Do not allow chemical containers or spray to get into drains, sewers, streams or ponds.
Do not allow reentry into treated areas until the spray has dried.

Growth regulation tips

Recommended use rates should provide between a 20% and 50% reduction in turf clippings for between 2 and 6 weeks following initial application.
However, in practice, the level of growth regulation that occurs will always be dependent on external factors like environmental conditions and management practices.
Application rates can always be adjusted (within reason and following the manufacturer’s guidelines) to accommodate management practices and growing conditions.
Primo HG will begin to regulate growth around 3 to 5 days after it is applied to the turf.
The product can be reapplied to the same area once turf has begun to grow again or when it is evident that additional suppression is needed.
Areas treated with Primo HG should continue to be maintained effectively through practices including fertilisation, irrigation, and weed, disease, and insect control.

Storage

Store Primo HG in the closed, original container in a cool, dry place out of the reach of children.
Do not store in direct sunlight.
Dispose of the empty container by wrapping it in paper, placing it in a plastic bag and putting it in the garbage.

Safety directions

May irritate eyes and skin.
Avoid contact with eyes and skin.
Wash your hands after use.

Re-entry period

After application, only re-enter (or permit public re-entry to) treated areas whilst wearing protective clothing until the spray has completely dried.

First aid

If poisoning occurs, contact a doctor or Poisons Information Centre immediately. The Poisons helpline is available 24 hours a day, 7 days a week from anywhere in Australia at 131 126.

For additional safety information, refer to the Primo HG Turf Growth Regulator Safety Data Sheet (SDS).

This information and product advice is not intended as advice or recommendations for any specific use or circumstance. Always seek specialist advice before using any product and follow the manufacturer’s guidelines. Specialist Sales’ liability is limited.

Withholding Period

Withholding Period Details WHP:

Do not graze treated turf/lawn or feed turf/lawn clippings from any treated area to poultry or livestock.

SDS & Technical

Primo HG Turf Growth Regulator Label	Download Pdf
Primo HG Turf Growth Regulator Label (APVMA)	Download Pdf
Primo HG Turf Growth Regulator SDS	Download Pdf
Primo HG Turf Growth Regulator Brochure	Download Pdf