Tray of rockwool cubes for germination, arranged in a grid in their black holder

Tray of 50 rockwool cubes of 2.5 cm, each with a seedling hole, on a white background

Young seedlings sprouted in damp rockwool cubes, grown in a greenhouse

Rockwool cubes for seedlings, 2 or 2.5 cm

Name: Rockwool cubes for seedlings, 2 or 2.5 cm
SKU: LDR-25-50
Price: 38.0 AED
Availability: InStock

Dhs. 38.00

These sheets of rockwool cubes get your seedlings and cuttings off to a start in batches: 150 cubes of 2 cm, or 50 cubes of 2.5 cm with a pre-drilled sowing hole. Mineral wool holds water well and keeps a stable pH.

Once the seedlings have emerged, each cube is potted on whole, into any grow medium you like.

Ref. LDR-25-50·Germination substrate

Format : 2.5 cm cubes, sheet of 50

2.5 cm cubes, sheet of 50

2 cm cubes, sheet of 150

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Delivery within 2 to 15 business days

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The summary

What you receive: one tray of 150 rockwool cubes measuring 2 cm, or 50 cubes measuring 2.5 cm, pre-drilled for the seed.
What they offer: reliable water retention, a stable pH and low conductivity.
After germination: the cube is potted on whole, into any receiving grow medium.
Handling: wear gloves, as rockwool is a mechanical irritant.

Mineral plugs of 2 or 2.5 cm, inert, for sowing in succession

The 2 or 2.5 cm rockwool cubes for seedlings are used to start seedlings and cuttings in batches: one sheet has 150 cubes of 2 cm or 50 cubes of 2.5 cm, pre-drilled for the seed. An inert grow medium, mineral wool retains water well and keeps a stable pH. Each cube is transplanted whole, into any receiving grow medium.

The cubes come lined up in a tray, 150 cubes of 2 cm or 50 cubes of 2.5 cm. This is the format to choose if you sow in batches rather than by the handful, and if each of your seedlings needs to be able to move on by itself, with its root ball, to its final position.

🧱 A mineral, inert plug

Mineral wool feeds nothing and does not decompose. It retains water well, keeps a stable pH and a low conductivity, so that everything your seedling receives comes entirely from the solution you pour on. The 2 cm cubes have a 99% dry matter content and meet standard NF U 44-551 on growing media.

A 2 cm cube is enough to take a seed through to its first true leaves, with a plug firm enough to handle. The 2.5 cm cube, 3 cm tall and with a sowing hole, gives the plug a larger volume and also takes cuttings. The cube is then transplanted whole, into a pot of potting compost, into a grow basket or into a larger cube, without ever being opened, since the roots pass through it and carry on into the receiving grow medium.

The gloves, and the tray that is drying

Mineral wool is a mechanical irritant: its fibres prick the skin and lodge under the fingernails. Wear gloves whenever you separate cubes, even for a handful. Moisten the tray before sowing and keep it damp until germination, then place it in a domed tray if your room is dry.

🌱 From germination to transplanting

Germination speed depends first on the temperature of the cube. A lettuce seed germinates in about 3 days at 20 °C, against 7 days at 10 °C, so a tray left in a cool room falls behind even though nothing has been done wrong. The seedling moves to a new container at the stage of 2 to 4 true leaves, with roots visible beneath the cube, that is 3 to 4 weeks after sowing for a salad or herb. To harvest without a break, sow a new row every 2 weeks, if you have the space, then transplant in small batches rather than all at once, as the guide to successful spring seedlings explains.

A slotted basket to hold each cube

At transplanting, the cube slips as it is into a 5 cm perforated growing pot, whose walls let the roots reach through to the solution. You then wedge the cube with a few clay pebbles, which keeps it upright while the roots lengthen. The plant thus moves from the seed tray to a tower, a gutter or a bed without ever leaving its plug, and it suffers no uprooting.

🔁 The cube in a water circuit

In aquaponics as in hydroponics, the inert nature of rockwool is exactly what you want from it, since nothing leaches into the water with the plant. The cube, transplanted into a net pot, joins a bed of clay pebbles, a channel or a vertical growing tower, and stays there until harvest. Nutrition comes from the fish water or from your complete fertiliser, once the seed has used up its reserves and the first true leaves unfold.

Technical specifications

The essentials

Dimensions of a cube: 2 cm or 2.5 × 2.5 × 3 cmThe 2.5 cm cube has a seeding hole drilled in it
Material: Mineral woolInert medium: it releases nothing into the nutrient solution.
2 cm cubes: 99 % dry matter, NF U 44-551The French standard governing growing media.
2.5 cm plate: 15 × 28.5 cmIts 50 cubes separate one by one, or in strips.

To budget for separately

Gloves: For any handlingMineral wool is a mechanical irritant on contact with the skin.
Fertilisation: A complete fertiliserThe medium provides nothing: feeding begins after germination.

In the box

1 sheet of mineral wool cubes, 150 cubes of 2 cm or 50 cubes of 2.5 cm depending on the format chosen

Dimensions, dry matter, NF U 44-551 compliance and the warning about mechanical irritation were recorded on 19/09/2026 and 01/10/2026 from the description of each size.

Which cube for your seedlings?

The same mineral wool in two slab formats: many small cubes, or fewer larger cubes.

Small cubes or larger cubes The number of seedlings and the size of the seed determine the tray format.

	Side of the cube (cm)	Cubes per plate	Start	Price
Recommended 2 cm cubesYour choice	2 cm	150	seed	Dhs. 59.00
2.5 cm cubesYour choice	2,5 cm	50	seed or cutting	Dhs. 38.00

2 cm cubesRecommended

The cube

Side of the cube (cm)2 cm

Cubes per plate150

The use

Startseed

The price

2.5 cm cubes

The cube

Side of the cube (cm)2,5 cm

Cubes per plate50

The use

Startseed or cutting

The price

Dimensions and number of cubes taken from the description of each size, on 19/09/2026 and 01/10/2026.

Estimate your
delivery time

The tray travels dry, in a flat, light parcel. The exact cost and final delivery times are shown in the basket once the address has been entered.

Frequently asked questions

6 questions

6 key questions

Why wear gloves when handling rock wool?

Is a 2 cm cube enough until transplanting, or do you need the 2.5 cm one?

Yes, up to the first true leaves. At this stage the roots hold the plug together, and this is precisely when the plant needs to move to a new container.

If you leave it longer, the roots grow out of the cube and search elsewhere: they tangle with those of their neighbours and separating them becomes tricky.

For a larger seed or a cutting, choose the 2.5 cm cube: taller and wider, it holds the plug together a little longer before the move to a new container.

Should you remove the cube before repotting?

Should you fertilise from the seedling stage?

Are the cubes suitable for a water circuit?

How do you moisten them before sowing?

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Rockwool cubes for seedlings, 2 or 2.5 cm

The summary