Transform Your Roof with the M‑Tray® Wildflower Modular Green Roof

Bring a breath of nature to your rooftop or podium deck with Wallbarn’s M‑Tray® Wildflower Modular Green Roof – an instant, eco‑friendly solution that blends charm, biodiversity, and practicality in perfect harmony.

What is the M‑Tray® Wildflower System?

The M‑Tray® Wildflower system is part of Wallbarn’s award‑winning modular green roof range, developed to make green roofing easier than ever. Each tray—measuring 500 × 500 × 100 mm—comes pre‑grown with a bespoke substrate and native wildflower and sedum mix, nurtured at Wallbarn’s UK nursery for 6–9 months. The trays click together seamlessly, requiring no specialist landscaping knowledge – making installation quick, clean, and accessible.

Why Choose Wildflowers?

Inclusion of native wildflower species – hardy, low‑growing perennials – is a key feature of the M‑Tray® Wildflower system. These are ideal for urban biodiversity efforts, attracting bees, butterflies, beneficial insects, and even birds. Sedum is included at low density to ensure some greenery year‑round, while the wildflowers add seasonal flair.

Award‑Winning Innovation

The M‑Tray® system has earned national recognition—securing Best Roofing Product at the 2020 Build It awards and Best Green Innovation at the 2021 Green Home Awards.

Such accolades emphasise how this modular system is not just environmentally beneficial, but also design‑led and forward thinking.

Fire Safety & Regulations

Safety is front and centre: the M‑Tray® achieves a B ROOF t(4) classification under BS EN 13501‑5, tested under CEN/TS 1187 Test 4 for fire spread. With 100 mm depth and less than 50% organic matter, the system meets stringent legal requirements in England, Wales, Scotland, and Northern Ireland. The aluminium edging and river‑stone fire borders help form a compliant hard edge buffer around roofs, drains and lights.

Simple & Adaptable Installation

• Modular trays can be hand‑carried and clipped into place, even in difficult‑access areas 

• Geotextile fleece prevents substrate migration and membrane damage.

• Click‑together brackets ensure tight seams—only a 6 mm gap, which plants quickly mask

• Edge trims slot into place neatly, without specialist tools.

• If access to the deck is needed, trays can be lifted without disrupting the entire installation – a notable advantage over roll‑out systems.

Costings & Logistics

The M‑Tray® Wildflower offers a cost‑effective route to greening . Pallets—each holding up to 32 trays—include transport charges (dependent on postcode) and use durable packaging for clean delivery. Trays weigh around 20 kg dry, up to 24 kg when saturated—roughly 100 kg per square metre saturated, so structural checks are advised.

Growth Cycle & Maintenance

M‑Tray® Wildflower roofs arrive with at least 90% vegetative cover. Flowering typically begins in the second year, with some species needing winter frost to germinate fully. Expect spring and summer blooms, followed by autumn die‑back. A sedum fallback ensures minimal bare soil visible.

Annual maintenance (2–4 times a year) is advised:

1. Clear debris and remove weeds in early spring and late summer.

2. Dead‑head wildflowers; distribute seeds by hand to encourage next year’s bloom.

3. Apply fertiliser (Wallbarn provides the same blend used at their nursery).

4. Irrigate only if rain is absent for two weeks (essential for commercial roofs, optional for residential).

Choosing Between Modular and Roll‑Out

• Roll‑out systems suit large or complicated roofs but need professional installers, have minimum material quantities, and replacing roof membranes is difficult and costly.

• Modular systems, like M‑Tray®, are ideal for smaller or awkward spaces, are DIY‑friendly, and improve long‑term access and maintenance ease.

Bespoke and Export Opportunities

Wallbarn offers tailored wildflower mixes and global licensing for empty trays. Their IP includes UK and EU registered designs and patents across multiple territories. For international projects, empty M‑Trays® allow local planting and propagation.

In Summary

Wallbarn’s M‑Tray® Wildflower Modular Green Roof delivers:

• Instant, mature greenery

• Native wildflower biodiversity

• Award‑winning design

• Fire‑safety NZmax B ROOF t(4) compliance

• Simple, modular installation & maintenance

• Cost‑effectiveness

• Global adaptability

Whether you’re a homeowner, architect, or developer, the M‑Tray® Wildflower is a practical, eco‑conscious choice. It allows you to channel nature’s beauty and ecological benefits onto rooftops, turning overlooked spaces into vibrant ecosystems. After all, creeping thyme‑pink flicking bees, swaying daisies, and popping cornflowers on a once‑bare roof make a compelling case for modern greening.

For quotes, bespoke consultations, technical specifications, or to explore roll‑out alternatives, get in touch with the Wallbarn team.