Returns: 30 days refund/replacement You can return any item within 30 days of delivery for a full refund or replacement, as long as it's unused and in its original packaging. Some products may be subject to restocking fees—see our return policy for full details.

Payment: Secure Transaction All payments are handled via industry-standard encryption and fraud protection. Your card details are never stored by us, and you’re covered by buyer-protection policies for a worry-free checkout.

Have a Question? Ask our Pros

Call Us at 888-233-2999 Mon - Fri 9am-5pm ET

Email our Pros We are here to help

Live Chat Our operators are standing by

Monosilicic acid (H4SiO4 aka ortho-silicic acid), the form found in Stout MSA, is the most bioavailable form of silicon. Stout MSA is immediately available to your plants and is stable over a larger pH range when compared to other silicon sources like potassium or sodium silicates (ex: will not gel under acidic conditions). This allows for more predictable delivery of silicon to your plants' tissues, which is important since silicon is immobile and therefore needs to be constantly supplied for maximum results. Stout MSA increases stem and leaf strength allowing the plant to better support dense flowers and fruits. Available silicon is also well documented to alleviate stress from heat, drought and frost damage. User-friendly application rates of 5 mL per gallon makes it easier to use with dosers and injectors.