Lava Rock (Coarse Grade) Potting Soil & Substrates GrowTropicals
GrowTropicals

Lava Rock (Coarse Grade)

Super chunky aeration for large aroids with thick roots

£3.99 £4.99 -20%
Pack Size

Sold out. FREE tracked delivery on orders over £60

Complete the set up
Description

Key benefits

  • Super chunky aeration for large aroids with thick roots
  • Porous rock that suits well-draining mixes
  • Drainage or sole substrate for low-nutrient terrarium plants
  • Large surface area hosts beneficial bacteria as a filter
  • 8-15mm grade that won't break down quickly

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

How to use
  1. Mix it into a chunky substrate for large aroids
  2. Or spread it as a drainage layer in a terrarium or vivarium
  3. Cover the layer with horticultural fabric or screening to stop finer substrate filtering down
Delivery and returns

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.

Hand-packed and sent tracked
14-day returns on unused items
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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.

View all FAQs

Why Grow Tropicals

Packed with care and ready to give

Packed with care

Packed with care

Every order is hand-packed in protective packaging and sent with tracked delivery, so it reaches you in one piece.

Free tracked delivery on orders over £60.

Ready to give

Ready to give

Add a gift message at checkout and we will handwrite it and pack it with your order.

Pair it with a plant for a complete gift.

Easy returns

Easy returns

Changed your mind? Send unused items back within 14 days of delivery and we will refund you.

Full details in our returns policy.

Verified reviews

Rated by real customers

Customers praised this coarse grade material for terrariums, plant topping, and tarantula setups. Shoppers noted rocks are 3-4cm with excellent color contrast against greenery. "Works a treat" with quick delivery and great packaging. One customer reported a broken package. Overall "top quality" and exactly as advertised.

  • Size around 3-4cm, colour gives great contrast with greenery
  • Works a treat, quick delivery, well packaged
  • Used for tarantula setups and to top off plants
  • 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

Lava Rock (Coarse Grade)
£3.99 £4.99