Power Si Original

In stock online
Standard Delivery £6.95*
We Will Beat Any Price* We Will Beat Any Price*
Standard Delivery £6.95* Standard Delivery £6.95*
Plain Packaging Used Plain Packaging Used
Product Name Qty Price
Power Si Original - 250ml
Out of stock
Power Si Original - 500ml
Power Si Original - 1L
Power Si Original - 5L


The original, patented form of stabilized, bioavailable silica for plants.  Often imitated never duplicated. Unlike other silica products, we work with the best possible silica matrix (patented) to enable superior absorption. Power Si is a proprietary mix containing highly bioavailable micro and macro nutrients. It is a pure, highly concentrated formula with fast visible effects. Silicon is considered the limiting factor for optimal crop yield and quality.  Power Si is the fastest way to deliver silica to your plants. 


  • Thicker stalks and stems
  • Increased lateral branching
  • Patented for superior absorption
  • Optimizes plant health
  • Increased resistance to abiotic and biotic stresses
  • Healthier plants result in higher yields and quality


  • Veg

    Clones: 0.5ml / Gallon
    Week 1: 0.5ml / Gallon
    Week 2: 0.5ml / Gallon
    Week 3: 0.5ml / Gallon
  • Bloom

    Week 1: 0.5ml / Gallon
    Week 2: 0.5ml / Gallon


  • Special (to slow vertical growth) - 6ml per 5 Gallon
  • Foliar Spray (maintenance) - 1ml per Liter / 4ml per Gallon
  • Foliar Spray (Repair) - 2ml per liter / 8ml per Gallon


  • 250ml
  • 500ml
  • 1L
  • 5L
Delivery & Returns
Next Day Delivery 12 Noon
Next Day Delivery
In a hurry for your order? Order before 1 pm Mon - Thurs for next working day delivery *subject to stock availability T&C's apply.
Different delivery address?
Different delivery address?
Do your goods need shipping to an alternative address? If so, paying by bank transfer gives you the freedom to have them delivered to anywhere in the UK.
Free Returns
Free Returns
Faulty or damaged item? No problem, contact us on 0800 038 7100 or customerservice@hollandhorticulture.co.uk and we can arrange a free collection.
Click & Collect
Click & Collect
You can now collect your online orders from our Manchester Store. Simply pay online & collect in-store!
Product Details
Brand Power Si

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