Raises the pH of nutrient solution that has become too acidic
Helps keep your reservoir in the 5.8 to 6.2 range
Adds a small boost of potassium
25% potassium hydroxide, so a small dose goes a long way
Botanixx pH Up 25%: Restore Balance for Optimal Growth
Drifting too far into the acidic zone can be just as dangerous as climbing too high. Botanixx pH Up 25% is the corrective tool you need when your nutrient solution becomes too acidic, ensuring your plants stay in the safety zone where growth happens.
Formulated with a concentrated 25% Potassium Hydroxide solution, this additive allows you to gently and accurately raise the pH levels of your reservoir. It is the perfect counterweight to accidental overdoses of acid or natural pH drops during the flowering cycle.
Please note that we currently do not have 1L and 5L bottles in stock at our nursery. Please allow 7–10 days for processing.
Why You Need It
Correct Acidity Instantly: When pH drops below 5.5, essential macronutrients like Calcium and Magnesium become "locked out," leading to deficiencies and stunted growth. This solution pulls the pH back up to a usable range.
The "Sweet Spot" Swing: Just like our pH Down, this product helps you maintain that critical window between 5.8 and 6.2. Keeping your reservoir in this range ensures that the full spectrum of nutrients remains available to your roots.
Bonus Potassium: Because this formula is based on Potassium Hydroxide (KOH), it provides a small additional boost of Potassium—a vital element for water regulation and flower development.
Concentrated Efficiency: With a 25% concentration, this is a powerful adjuster. You do not need to pour half the bottle in to see a result; a small dose goes a long way.
Safety First
This is a strong alkaline solution (a base) and is corrosive. Always handle with care. We strongly recommend using gloves, goggles, and proper protective gear whenever you are handling or measuring this liquid. Avoid contact with skin and eyes.
Pro-Tip: Check Your Silicon First
If you are using Botanixx Liquid Silicon, remember that silicon is naturally very alkaline and will raise your pH significantly on its own! Always mix your silicon first, let it settle, and check your meter. You might find you do not need to add extra pH Up at all.
How to use
Wear gloves and goggles, and avoid contact with skin and eyes
If you use liquid silicon, mix it in first, let it settle and check your meter
Add a small dose of pH Up to your reservoir and mix
Check the pH with your meter before adding more
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.
