Wallbarn M-Tray Wildflower Modular Green Roof System

Bring biodiversity to your rooftop with the Wallbarn M-Tray® Wildflower System—a ready-to-install modular green roof that combines vibrant wildflowers with hardy sedum in specially engineered trays. Each tray is pre-planted with a carefully curated mix of native UK species grown from seed at our own nurseries, offering a natural, pollinator-friendly habitat right above your head. The M-Tray® system makes green roof installation fast, clean, and simple. The trays are lightweight and easy to carry, clicking together to form a seamless blanket of vegetation. Designed for long-term performance, they contain a bespoke low-nutrient substrate that supports perennial wildflowers and sedum varieties known for their resilience and ecological value. These green roofs not only look stunning in full bloom but also offer a practical and meaningful way to improve biodiversity in urban environments—encouraging bees, butterflies, birds, and other wildlife back into built-up areas.

Key Features & Benefits

• Instant green roof solution – fully established sedum/wildflower mix for immediate impact
• Trays click together – forming a seamless, natural-looking finish
• Pre-grown in the UK – using native wildflowers and sedum species for optimal biodiversity
• Designed for wildlife – attracts pollinators and supports urban greening schemes
• Low-maintenance substrate – supports hardy, perennial plant growth
• Deep root zone (100mm) – ensures healthy, long-lasting vegetation
• Fire-rated – classified B ROOF (t4) in accordance with CEN/TS 1187 Test 4
• Easy installation – trays can be lifted into tricky areas and fitted with minimal fuss
• Flexible access – trays can be removed and replaced individually for deck maintenance

What to Consider with Wildflower Roofs

Wildflower green roofs are beautiful and ecologically rich, but they behave differently from traditional sedum roofs. Here are a few key points to keep in mind: Wildflowers grow taller and die back in autumn, leaving stems and seed heads that can become dry and potentially flammable if not maintained They offer seasonal blooms but less year-round ground cover than sedum-only roofs Flowering typically starts in the second year; growth and bloom cycles depend on weather conditions Some re-seeding may be required to maintain a consistent display They require slightly more upkeep, such as deadheading, occasional replanting, and seasonal checks The sedum component helps to maintain a green appearance all year round, even when wildflowers are not in bloom, ensuring a visually pleasing and ecologically valuable result across all seasons.

FAQs – Wallbarn M-Tray® Wildflower

How long will it take for the wildflowers to bloom?

Most wildflower species begin flowering in their second year. In the first year, they focus on root and foliage development, which is essential for long-term health and resilience.

Do wildflower green roofs need regular maintenance?

Yes, they require more maintenance than sedum-only roofs. Expect to carry out light weeding, trimming, and re-seeding where needed, especially after winter or periods of drought.

Will the trays stay green all year round?

The sedum component is designed to provide consistent ground cover throughout the year. Wildflowers offer seasonal colour and biodiversity, with the sedum ensuring the roof doesn’t look bare outside of flowering periods.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
• Friendly, knowledgeable customer support.
  
• A trusted business backed by the JJ Roofing Supplies Group.
  

Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.

Multiple Products from the Same Supplier

If you're ordering multiple products from the same supplier, your order will be dispatched together once all items are ready. This means the longest lead time will apply.

If you need part of your order sooner, please call us on 01202 113233. We can arrange a split delivery, although an additional shipping charge will apply.