Primo Maxx Growth Regulator

Primo Maxx – Professional Turf Growth Regulator

Less mowing, more showing.
Primo Maxx is a liquid plant growth regulator that slows vertical leaf and stem growth in actively growing lawns — delivering a tighter, denser surface with rich colour and improved stress tolerance. It’s the go-to product for professional turf managers and homeowners who want that manicured, stadium-level finish without constant mowing.

Formulated with Trinexapac-ethyl (120 g/L), Primo Maxx redirects energy from top growth into root and lateral development. The result is up to 50% fewer clippings, better drought and wear resistance, and a smoother, more uniform turf surface that’s easier to maintain.

How much to apply:
Apply 1–4 L/ha (≈ 10–40 mL per 100 m²) depending on turf type and growth rate.
Use on Couch, Kikuyu, Buffalo, Ryegrass, Fescue, and Bentgrass when turf is actively growing.
Apply at least 6 hours before or after mowing, then water lightly if rainfall isn’t expected within 1 hour. Repeat every 4–6 weeks as growth resumes.

Primo Maxx is also ideal for Poa annua management — helping desirable turf species gradually outcompete unwanted annual grass without aggressive renovation.

If you’re unsure how to time your applications or integrate growth regulation into your maintenance plan, explore The Lawn IQ Programs for a tailored schedule that keeps your lawn dense, dark, and perfectly under control.