Nutrifield Si-Phi 5L

Si-Phi® is part of the Nutrifield Plant Health Enhancer Range, a dual-action plant strength and resilience additive that goes well beyond what a standard silica supplement can offer.

Most silica products do one thing: strengthen plant tissue. Si-Phi® does two. By combining bioavailable silica with potassium phosphite, it delivers both structural reinforcement and plant signalling support, making it a significantly more effective tool for growers running high-intensity cultivation environments.

Silica, supplied in a highly plant-available form, is deposited directly into cell walls and epidermal tissue, reinforcing structural integrity, building thicker stems, and increasing the plant's physical capacity to support heavy flower loads. Stronger tissue also supports more stable water and nutrient movement throughout the crop, keeping performance consistent under demanding conditions, including high light intensity, elevated EC, and environmental fluctuation. Potassium phosphite adds a second layer of function that standard silica simply can't deliver. Rather than acting as a conventional nutrient, phosphite engages plant signalling pathways linked to stress response and metabolic stability. The plant becomes more resilient, better equipped to maintain performance when conditions get tough.

The clean, stable formulation integrates easily into intensive feeding programs and is reliably compatible across hydro, coco, and soil systems. The result is a stronger plant structure, improved stress tolerance, and more consistent crop performance from vegetative development through to the end of flowering.

As part of the Nutrifield Plant Health Enhancer Range, Si-Phi® provides the structural and physiological resilience that underpins stable, high-performance cultivation. If you're pushing your plants hard, this is the product that helps them handle it.