Lava Rock (Coarse Grade)

/
Lava Rock (Coarse Grade) Substrate GrowTropicals

Lava Rock (Coarse Grade)

/
Save an additional 15% on all plant orders over £75

Use code EASTER at checkout

Pack Size
Tax included. Shipping calculated at checkout.
  • Free Shipping Over £60
  • Live Arrival Guarantee
  • RHS Chelsea Flower Show Gold Medalist
Carbon-neutral shipping with Shopify Planet
Carbon-neutral shipping on all orders

Free Shipping

On All Orders Over £60

Product Information

For the largest aroids with thick, strong roots lava rock may be the appropriate choice for that super chunky substrate mix. Its porosity lends itself to well-draining mixes. Lava rock is also often used as drainage and/or as the sole substrate in terrariums where the plants don’t require a high level of nutrients.

Lava rock is also great drainage material for vivariums. Lava rock is a great substrate that has a high surface area making it an ideal filter/drainage material that won't break down quickly. We recommend covering lava rock with a material such as horticultural fabric or synthetic screening to prevent smaller-grained substrate materials from filtering down into it.

Lava rock is also an excellent biological filter. The large surface area lends itself to a high volume of beneficial bacteria, Nitrosomonas and Nitrobactercomes, that will convert ammonia into nitrite and nitrite into nitrate respectively.

8-15mm Grade

 

FAQs

We offer free mainland delivery on all orders over £60

All plants are shipped using express next day services with DPD, UPS, Parcelforce and Royal Mail.

We offer economy shipping (3-5 day dispatch) and standard delivery (1-3 day dispatch).

For guaranteed next day dispatch please selected Express shipping at checkout available at an additional cost.

For a full breakdown of shipping prices please see our help center here.

Winter shipping is available in the winter months at an additional cost and includes heatpacks and thermal insulation where necessary.

For more information, please see our comprehensive shipping FAQs

All plants are shipped in their plastic nursery pot unless otherwise stated.

Plant pot sizes can fluctuate +/- 1cm.

We recommend to always size up your decorative pot by 1-2cm larger than the stated plant pot size. For example if you are purchasing a 12cm plant, you should purchase a 14cm decorative pot to ensure it will fit correctly.

We pride ourselves on the love and care with give our plants. Our entire team are plant obsessives at heart and so we go above and beyond to care for the plants we have in stock.

That said, plants are living beings and may differ slightly from the photo provided unless otherwise stated. Small leaf imperfections may be present and won't be compensated for.

Some plants such as Begonia may suffer slight leaf melt when shipped. This is normal and nothing to be concerned about.

All our plants are stores and/or grown in our nursery under LED lighting so they are in active growth when arriving with you.

The conditions in our nursery are a minimum of 60% humidity and 19C year round.

If you have any questions about caring for your plants or setting up your home for success, don't hesitate to contact us.

See What's In the Box!

See behind the box with these awesome unboxing videos from some of our favourite Youtubers.

Packaged With Care

We've tested and refined our packaging across tens of thousands of orders over the years. Our streamlined system uses minimal materials while ensuring maximum protection.

Plus, every plant comes with a 7-day live arrival guarantee—so if the unexpected happens, we've got you covered!

100% Quality. 0% Compromise.

We're a team of plant enthusiasts who understand the joy of receiving a new plant. That’s why we go the extra mile to ensure every order brings the same excitement.

Our packaging process is designed with quality control at its core—each plant is carefully inspected by hand before shipping to guarantee it arrives healthy, pest-free, and in perfect condition.

Give the Gift of Green

All our houseplants arrive fully potted and ready to grow—no extra fuss required! They make incredible gifts for any plant lover (or soon-to-be plant parent!). 🎁

Want to send a surprise? We can ship your gift directly to the recipient, and if you leave a greeting message at checkout, we’ll swap out the invoice for a gift note—because who doesn’t love a little extra plant happiness in their day? 🌿✨