Wallbarn M-Tray Modular Sedum Wildflower Green Roof - 500mm x 500mm x 100mm

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Product Description

It is getting easier and cheaper to convert flat roofs and podium decks into attractive, useful, environmentally friendly green spaces. But it is Wallbarn's innovative modular solution that has taken the greatest strides in overcoming some of the challenges historically associated with designing and installing green roofs.

How does Wallbarn's Green Roof Sedum Wildflower M-Tray system work?

The superior vegetation in Wallbarn's M-Trays is pre-grown in specially-designed modules for approximately six months at their dedicated UK nursery. Wallbarn have developed its own specially-designed substrate mix which means there is considerable root growth already in the tray. This ensures that by the time they are delivered the plants are strong, established and provide consistent cover over the intended area.

The modules contain a carefully-selected mixture of flowering sedum varieties, providing year-round greening and also different textures and flowers throughout the summer.

The modules are highly portable and simply clip together, meaning they can be installed much faster than roll-out systems without any specialist landscaping or roofing knowledge. The M-Tray's unique design means rainwater gets retained far longer and very little maintenance is required through the seasons.

What species of sedum are used in Wallbarn's Sedum Wildflower M-Tray?

The carefully selected mix of annual and biennial seeds will produce flowers up to a height of 50cm (some may reach up to 80cm) that attract both bees and butterflies. The seeds are mixed with coir to help kick-start the germination process and facilitate an even distribution.

A much greater amount of maintenance is required for wildflower green roofs. Every Autumn the plants will need to be deadheaded, dry stalks and other vegetation needs to be  removed. Any unwanted vegetation including windborne weeds also need to be removed. These wildflowers are annual and biennial so new seeds must be broadcast every Spring.

The varieties of wildflower used in this green roof system will flower from Spring to late Summer. This means that without a significant amount of sedum in the mix, the green roof can appear sparse and patchy in places, which will affect the aesthetics of the green roof system during Autumn/Winter. For customers wanting all year round full coverage, a sedum only option is also available.

Please note, annual flowers often take 2 to 3 years to germinate and many also require a hard winter frost to crack the seed cases. Perennial flowers will often start to flower at the end of Summer too, so customers are warned not to expect an instant spring meadow replicated on their roof.

Surface preparation

Prior to installation, a geotextile fleece should be laid under the trays to help prevent soil deposits entering the drainage system. Wallbarn supplies a recycled geotextile fleece for this purpose.

Features & Benefits

  • No loose substrate on the roof
  • No sharp aggregate damaging your waterproof membrane, blowing away or clogging up drains
  • Modules packed onto pallets for easy transportation
  • Ideal for areas with restricted access
  • Faster, easier installation
  • Low growing, perennial plants selected to limit fire hazard risks
  • Expert knowledge not required for installation
  • Vegetation fully established with strong, healthy growth
  • Strong root structure reduces dependence on irrigation
  • An instant and sustainable green roof


Size: 500mm x 500mm

Depth: 100mm

Trays per m2: 4

Weight: 20kg (24kg when saturated)

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Questions & Answers


Can the trays be cut down in size to fit the roof?


No unfortunately not, so you would need to have slightly less trays and can fill in the outside gaps with an aggregate to create a nice look.


Can the trays be cut down in size to fit the roof?


No unfortunately not, so you would need to have slightly less trays and can fill in the outside gaps with an aggregate to create a nice look.


Can the trays be cut to size?


These cannot be cut to size.

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Wallbarn M-Tray Modular Sedum Wildflower Green Roof - 500mm x 500mm x 100mm

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