Builds stronger cell walls for sturdy, upright growth
Helps variegated leaves stay crisp, without brown edges
Toughens leaves to reduce pest and disease pressure
Improves resilience to heat, drought and light stress
6% potassium silicate, used at 0.5ml per litre
Botanixx Liquid Silicon: The Backbone of Your Indoor Jungle
Strong plants start with a strong structure, and that is exactly where Botanixx Liquid Silicon comes in. Think of this as the essential "armour" for your collection, giving your plants the backbone they need to stand strong and thrive, whether they are growing under powerful LEDs or out in the open.
Available in both 500ml and 1L bottles off the shelf (or in 5L or 10L on special order), this additive is not just hype, it helps your plants build a firmer structure from the inside out. You will see the difference in the way they hold themselves.
Why We Love It
Builds Natural Strength: Silicon integrates into the cell walls, helping plants build a robust structure that supports self-supporting, upright growth.
Pest Defence: By toughening plant surfaces and tissues, this supplement reduces pest and disease pressure, making your leaves harder for bugs to penetrate.
Stress Resilience: It enhances resilience against heat, drought, and light stress, helping your jungle cope when conditions aren't ideal.
Nutrient Boost: It boosts nutrient uptake through healthier roots and tougher tissues, ensuring your plants feed properly.
The Variegation Saver
If you collect high-value variegated plants (like Monstera Albo or variegated Alocasias), Silicon is a non-negotiable addition to your routine. Variegated sections of leaves lack chlorophyll and are structurally weaker, often leading to browning or "melting." Botanixx Silicon thickens leaves and strengthens those delicate cell walls, keeping your variegation crisp and preventing those dreaded brown edges.
Special Order
Please allow 7 working days for delivery on the special order products
Product Details
Formulation: 6% Potassium Silicate (K2O3Si)
Dilution Rate: A highly concentrated 0.5ml per litre
Application: Plant strength and stress resistance supplement
Pro-Tip: Mixing Order Matters
Because Botanixx Silicon is highly concentrated, always add it to your water first and give it a good stir before adding your other nutrients. This prevents "lockout" and ensures your plants can absorb 100% of the goodness.
How to use
Add 0.5ml per litre to your water first
Stir well before adding any other nutrients
Delivery and returns
See all delivery pricing tiers
Based on your basket total, confirmed at checkout. Free delivery: Economy over £60 · Standard over £100 · Express over £150.
Every order is hand-packed and sent with tracked delivery.
Changed your mind? You can return unused items within 14 days of delivery. See our returns policy.
Your quick reference for choosing the right plant size. We group our plants by the diameter of their nursery pots which gives you a consistent way to understand scale.
5–8cm
Mini
Small but full of charm. These compact plants are perfect for desks, windowsills, and small shelves, or for building out a collection over time. Ideal if you enjoy watching your plants grow from the beginning. Approx. height: 10–20cm
9–11cm
Small
A step up in presence, great for side tables, shelves, or styling in clusters. Easy to move around and perfect for adding greenery without taking up too much space. Approx. height: 25–35cm
12–14cm
Medium
Our most versatile size. Works beautifully on shelves, desks, and plant stands, offering a fuller look without dominating a space. A great balance between impact and flexibility. Approx. height: 25–50cm
15–18cm
Large
More established plants with fuller foliage and stronger structure. Ideal for creating soft focal points in a room. Great for corners, beside furniture, or as standalone features. Approx. height: 40–70cm
19+cm
Extra Large
Big, impactful plants designed for floors and open spaces. These are your statement pieces and are perfect for anchoring a room or transforming a corner with instant greenery. Approx. height: 60cm–1.3m
Pots that fit this plant
We recommend
In their words
What our customers say
EP
Emily P.
Arrived just like the photos - maybe even fuller. Healthy, well-acclimated, and straight into my collection with no issues.
JR
James R.
Flawless leaves, stunning variegation, and clearly cared for by experts. It’s already a talking point in my home office.
SL
Sophie L.
Hard to find rare plants that are pet-safe. Ours arrived in perfect condition and looks amazing without any worry.
Good to know
Frequently Asked Questions
What is your returns policy?
Changed your mind? You can return pots, gifts, accessories and other non-plant items. Email hello@growtropicals.com with your order number within 14 days of delivery, then send the item back within 14 days of telling us. You pay the return postage.
Items must come back unused and in their original condition. If an item has been used, we may reduce your refund by the value it has lost, and for used items this can be the full price.
Live plants cannot be returned because you have changed your mind, but they are covered by our Live Arrival Guarantee.
If something arrives damaged, faulty or wrong, email us with your order number and photos and we will put it right at no cost to you. Full details are in our returns policy.
When will my order arrive and how much is shipping?
Choose your delivery speed at checkout. Express orders placed before 1pm are dispatched the same day, otherwise the next working day. Standard orders are dispatched within 2 to 3 working days and Economy orders within 4 to 5 working days. Once dispatched, every order travels by 24 hour tracked courier.
Delivery is free on orders over £60 with Economy, over £100 with Standard and over £150 with Express. Below that, the charge depends on your basket total and is always shown at checkout before you pay. The full price list is in our shipping policy.
Orders without plants are dispatched Monday to Friday. If your order also includes plants, it goes out Monday to Thursday so the plants are not left in the courier network over the weekend. Delivery can take longer at busy times such as Black Friday and Christmas.
Every order is hand-packed in eco-friendly, protective packaging - refined through thousands of deliveries to ensure your plant arrives healthy, hydrated, and looking its best.
Backed by our Live Arrival Guarantee.
Perfect for Gifting
From rare collector’s pieces to easy-care favourites, our plants arrive fully potted and ready to enjoy. Add a personalised note at checkout for a thoughtful finishing touch.
Delivered fresh, beautiful, and gift-ready.
Sustainability at Heart
All plants are ethically sourced from trusted growers, never wild-collected. Every order ships carbon-neutral in minimal-waste packaging.
