Why Bother With a Bug Hotel?

If you already grow plenty of flowers, you will have noticed that the busiest corner of the garden is rarely the showiest one. It is the patch of wall where the sun lingers, or the old fence post with a few holes drilled in it. Solitary bees and ladybirds are not fussy about accommodation, but they are specific about conditions, and a well-made bug hotel gives them exactly what they need in a small space. It also gives you somewhere to put all those hollow stems you cut back in spring, which is a satisfying little loop to close.

This is not about building a grand, ornamental tower. A simple, sturdy box filled with the right materials will outperform anything fancy, and it takes an afternoon. The trick is to treat it as a living structure that needs a tidy-up once a year, not a garden ornament you forget about.

Choosing a Spot That Works

Position matters far more than the timber you use. In the UK, solitary bees need warmth to become active, so a south or south-east facing spot is ideal. Aim for a wall, fence or shed that catches the morning sun and stays dry through the afternoon. Height of about a metre to a metre and a half keeps the hotel out of the dampest ground layer and away from slugs and mice, though it is not critical.

Two things to avoid:

• Driving rain and prevailing wind. A hotel that fills with water in October will rot, and wet canes grow mould instead of bees.
• Full shade. Cool, shaded boxes are rarely used, however well filled they are.

Fix the box firmly. A wobbly hotel rocks in the wind, and a bit of movement is enough to dislodge fragile overwintering insects.

The Frame and the Filling

Any untreated timber will do — offcuts of scaffolding board, old pallet wood, a solid wooden crate. Avoid tanalised or painted wood on the inside, and skip anything that has been treated with preservative. Build an open-fronted box roughly 30 cm wide, 30 cm high and 15 to 20 cm deep, with a solid back. A roof that overhangs by a few centimetres will shed water, and a slight forward tilt helps rain run off rather than soak in.

Once you have your empty box, treat it as a set of rooms rather than one big space. Divide it with a couple of horizontal shelves so you can offer different materials without them all tumbling into one another.

Hollow Canes for Solitary Bees

This is the heart of the hotel. Mason bees, leafcutter bees and their relatives lay eggs in hollow tubes, packing each cell with pollen and sealing it with mud or chewed leaves. What they need is a tube that is open at one end, closed at the other, and the right diameter.

• Use bamboo, reed, or hollow plant stems such as old teasel, hogweed or buddleia prunings.
• Cut lengths of 10–15 cm and cut them cleanly with secateurs or a fine saw so the ends are smooth, not crushed.
• Offer a range of diameters — 2 mm to 10 mm covers most species. A mix is far better than one uniform size.
• Pack them horizontally, open ends facing out, snug enough that they do not shift.

Push the canes right to the back of the box so there is a natural closed end. If your material is hollow straight through, stand a solid board behind it. Never block the front with mesh — the bees need to walk in.

Drilled Wood and Other Nesting Blocks

A block of dry, untreated hardwood with clean drilled holes is an excellent addition and lasts far longer than canes. Drill holes between 3 mm and 10 mm across, roughly 8 to 10 cm deep, and do not drill all the way through — leave a solid base. Space the holes about 2 cm apart so the wood does not split.

Drill into the end grain of a log where possible, and sand the entrance holes lightly to remove splinters. Softwood splits and frays; hardwood such as oak, ash or beech is worth the extra effort. Set the block among the canes so the whole front of the hotel is busy with different sized openings.

Ladybirds and Dry Leaves

Ladybirds, along with lacewings and some hoverflies, want something completely different: a dry, sheltered crevice to cluster in over winter. Give them a separate compartment filled with:

• Dry leaves — gathered in autumn and kept dry, not soggy.
• Corrugated cardboard rolled into tubes, which mimics bark crevices beautifully.
• Pine cones and dry straw, loosely packed so there are gaps to tuck into.
• Small bundles of dry twigs tied together.

Keep this section dry and slightly shaded. Ladybirds will often arrive in late autumn in groups, and a good overwintering site can hold dozens at once.

Spring Maintenance and Replacing Damp Materials

A bug hotel is not maintenance-free, and this is where most of them fail. Damp canes and mouldy leaves become a nursery for disease rather than a home for insects.

Each spring, ideally in March before the bees emerge, open the box and check the contents:

• Replace any canes that feel damp or show mould. Pull them out, bin them, and refill with fresh dry stems.
• Refresh the leaf and cardboard compartment every year, using dry material stored indoors over winter.
• Leave sealed bee tubes alone. If a cane has a mud plug at the front, a bee is developing inside. Put it back gently and wait until it emerges.
• Check the roof and fixings. A leak or a loose bracket undoes a whole year of careful work.

After April, leave the hotel undisturbed until the following spring. The reward is a garden that hums a little louder each year, with leafcutter bees trimming your roses and ladybirds patrolling the aphids on your beans — all from a box of stems and a few dry leaves.