The strongest part of a plant is the part you never see being built.

Silicon is one of horticulture's quiet over-achievers. Most base feeds barely mention it, yet plants use it to reinforce their cell walls, the same way steel bars sit hidden inside concrete. The catch is that plants can only absorb silicon in one form: monosilicic acid. Many silicon additives are potassium silicate, which has to convert before a root can use it. Grenade White skips the waiting room. It's a maximum-strength, highly stabilised monosilicic acid (also called orthosilicic acid) that's ready to go to work the moment it hits the root zone.

MSA Max – what it does

Faster root establishment for seedlings, cuttings and fresh repots
Increased chlorophyll production for deeper, greener growth
Stronger stems and better plant structure – fewer flops, fewer stakes
Greater resilience against environmental and pest stress
Improved nutrient availability within your root zone

Seed to harvest, and everything in between

Grenade White isn't just for serious growers. It's the fix for the Monstera stem that won't hold itself up, the leggy seedlings on the windowsill, the cuttings that sulk instead of rooting, and the chilli and tomato plants that buckle under the weight of their own crop. If a plant has stems, it has a use for silicon.

Do the maths

Even at the full recommended dose of 0.4ml per litre, one 100ml bottle treats 250 litres of water – about 15p per litre. If you water a houseplant collection with a 5 litre can once a week, a single bottle lasts around a year. It's the cheapest structural engineer you'll ever hire.

How to use

Dose: 0.4ml per litre for full effect. Use 0.2ml per litre for brand-new seedlings and fresh cuttings for their first week or two, then step up to 0.4ml. Don't go above 0.4ml.
When: at every feed and watering, from seed or cutting all the way through to harvest. No breaks needed – silicon works by building up over time.
Order: mix into plain water first, before any other nutrients.
Storage: keep in a cool, dry place.

Size	At 0.4ml/L	At 0.2ml/L
100ml	250 litres	500 litres
250ml	625 litres	1,250 litres
1 Litre	2,500 litres	5,000 litres
5 Litre	12,500 litres	25,000 litres

🌱 Rose's Pro-Tip

Silicic acid always goes in first, into plain water, and the order genuinely matters. Adding it after your base feed can cause it to react before your plants ever see it. Mix it fresh on the day rather than leaving a pre-made batch sitting for days – and be consistent. Silicon rewards every-feed use far more than the occasional big dose.