Lava Rock (Coarse Grade) Potting Soil & Substrates GrowTropicals

Lava Rock (Coarse Grade)

£3.99 £4.99 SAVE 20%
Pack Size

FREE tracked delivery on orders over £60

Complete the set up
Description

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

Delivery & returns

Order by 1pm Monday to Friday for same day dispatch. Every plant travels in protective, plant-safe packaging with tracked delivery.

Changed your mind? See our Return Policy.

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7 day live arrival guarantee
Delivered to your door with care
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In their words

What our customers say

Arrived just like the photos - maybe even fuller. Healthy, well-acclimated, and straight into my collection with no issues.

Emily P.

Flawless leaves, stunning variegation, and clearly cared for by experts. It’s already a talking point in my home office.

James R.

Hard to find rare plants that are pet-safe. Ours arrived in perfect condition and looks amazing without any worry.

Sophie L.
Good to know

Frequently Asked Questions

What is your returns policy?

We always aim to make sure our customers love our products, but if you do need to return an order within 14 days of purchase (not including plants*), or any items are damaged, we’re happy to help. Just email us directly at hello@growtropicals.com, and we’ll take you through the process. 

Please note: we cannot be held liable for any packaging costs should the original packaging be discarded.

*Unfortunately we cannot accept returns of undamaged plants as these are perishable items and are not saleable upon return. If a plant is damaged, we will compensate for this as per our live arrival guarantee.

When will my order arrive and how much is shipping?

When placing your order, you can choose from three dispatch speeds to suit your needs: Economy (prepared and shipped within 4-5 days), Standard (3-5 days), or Express (dispatched the very next day). Please keep in mind that "dispatch" refers to the time it takes our team to prepare and pack your items before handing them over to the courier, not the total delivery time.

Shipping costs are based on your total order value and will be calculated at checkout, with free shipping automatically applied to all orders over £60. For a full breakdown of shipping prices see our Help Centre.

Additionally, to protect the health and quality of our live plants, orders containing plants are exclusively shipped Monday through Thursday. This careful scheduling prevents your plants from being stuck in a dark shipping depot over the weekend, ensuring they arrive at your door vibrant and healthy.

Why Grow Tropicals

Plants delivered the way they deserve

Packaged with Care

Packaged with Care

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

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

Sustainability at Heart

All plants are ethically sourced from trusted growers, never wild-collected. Every order ships carbon-neutral in minimal-waste packaging.

Good for your home - and the planet.

Verified reviews

Rated by real customers

Customers praised this coarse grade lava rock for terrariums, plant decoration, and tarantula setups. Shoppers appreciated the 3-4cm rock size and contrast with greenery. Reviews highlighted "excellent" quality, accurate descriptions, quick delivery, and good packaging. One customer noted a broken package. Overall highly rated for versatility.

  • The size is around 3-4cm and the colour gives a great contrast with greenery.
  • Works a treat, quick delivery, well packaged, great communication.
  • Used for my tarantulas and to top off a few plants, I like using it.
  • 5 stars: 10 (91%)
  • 4 stars: 1 (9%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
M
MR

Excellent, just what i was looking for but need another 8 bags

M
MR

Excellent, just what i was looking for but need another 8 bags

S
Simona S.
Excellent

Excellent

P
Peter

Great ,thanks

P
Peter Donnan

Great ,thanks

H
Hannah W.
I bought this mostly for

I bought this mostly for terrarium dressing and adding some texture, the size of the rocks are around 3-4cm and the colour gives a great contrast with greenery.

K
KAREN J.
as described, works a treat,

as described, works a treat, quick delivery, well packaged, great communication.
100%.

L
Ludmila S.
Lave Rock package (one been

Lave Rock package (one been broken)

Hi Ludmila,

I'm really sorry to hear that one of your lava rock packages has been
damaged.

Would you be able to send us a picture of this so that we can take a look
and best resolve this for you?

C
Christopher D.
Arrived in expected time slot

Arrived in expected time slot and was as advertised. Not had opportunity to use, however looks exactly as advertised.

S
Sharon j.
Top quality :grinning_face_with_star_eyes:

Top quality :grinning_face_with_star_eyes:

M
Melanie H.
Used In the set up

Used In the set up s I have for my tarantula s and also used to top off a few plants I have , I have used before and I like using it

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