Iwan created a living roof on top of the summer house to try and attract butterflies and moths, and here's what he planted :

• Wall-rue
• Maidenhair spleenwort
• Wall lettuce
• Limestone fern
• Angular Solomon's-seal
• Dark-red helleborine
• Rigid buckler-fern
• Daisy
• Bugle
• Bulbous Buttercup
• Bird's-foot Trefoil
• Wild Strawberry
• Barren Strawberry
• Creeping Cinquefoil
• Tormentil
• Agrimony
• Limestone woundwort
• Deptford pink
• Garlic Mustard