Garden Nests

Wasp Nest in the Garden — Ground, Decking, Hedge & Tree

From a hole in the lawn to a football-sized aerial nest in the hedge, garden nests are some of the most dangerous because you cannot avoid the space. Do not mow, do not strim, do not water the hole. Call us on 01727 789571.

A hole in a lawn with wasps emerging from an underground nest cavity

The four common garden nest types

Type	What it looks like
Underground / ground nest	A single hole in lawn, border, bank, or under a hedge with a steady stream of wasps. Often no visible nest material — the nest is below ground.
Under decking or patio	Wasps entering and exiting a gap at the edge of decking or under the lip of a paving slab. The nest is in the void below.
Hedge nest	Football-sized grey paper nest visible inside a dense hedge — typically privet, conifer or beech. Often only discovered when trimming the hedge.
Tree nest	Aerial grey papery nest attached to a tree branch or built in a tree cavity. More common in mature gardens with established trees.

Underground / ground nests — most common in larger gardens

The single hole with low-level traffic. The classic sign. Often discovered when mowing, gardening or watching the dog nose around. Walk away — do not investigate at close range.

Multiple wasps emerging from one point on a bank or under a hedge. Ground nests have one main entrance but sometimes additional small exits. Treat the visible entrance — wasps from other exits will return through the treated one.

Under-decking nests

The void under decking is the perfect nest cavity: ventilated, sheltered, predator-free and large. We treat dozens every season across Hertfordshire. Treatment is at the edge of the decking where wasps enter; boards never need to be lifted. The colony is rendered inactive within 2-4 hours.

Hedge and tree nests

Aerial nests in hedges and trees are visually obvious once spotted — a grey, papery, often football-sized structure with a single visible opening. The risk is that hedge nests are often only discovered mid-trim by someone with shears, which is too late to back off safely. If you see one, stop work and call us.

What NOT to do

Do NOT	Why
Mow or strim near a ground nest	Vibration is the strongest trigger for a defence response from a ground colony. Multiple stings are likely within seconds.
Pour boiling water down the hole	Does not reach the nest cavity. Provokes immediate mass defence from every available exit.
Block the entry hole during the day	Foraging wasps return and cannot get in. They become aggressive at the entry point and will sting anyone nearby.
Try to dig up a ground nest	Even fully suited beekeepers do not dig out live wasp colonies. The nest is connected to a network of soil tunnels and the response is immediate and massive.
Burn or smoke a hedge nest	Hedges are dry. Fires are not controllable. This causes hedge fires every summer in the UK.
Spray bug killer at an exposed hedge or tree nest	Provokes immediate mass attack from a colony that may number several thousand wasps. Multiple stings within seconds. Do not try.

How we treat garden nests

All four garden nest types are treated using the same principle: insecticide powder applied at the entry point of the nest, from a safe distance, at the right time of day for the nest type. The colony is rendered inactive within 2-4 hours in almost every case. We never use sprays for exposed nests — powder is safer and more effective.

Related guides

Frequently asked questions — garden nests

I have a hole in the lawn with wasps going in and out — what is it?+

Almost certainly a ground wasp nest, built by common wasps (Vespula vulgaris) or German wasps (Vespula germanica). The hole is the only entrance to a nest excavated in soil below. Do not block the hole, pour anything into it, or run a mower nearby.

Can I just mow around the nest and leave it?+

Risky. Mower vibration is one of the most consistent triggers for a mass defence response from a ground colony. Even mowing 3-4 metres away can provoke an attack. Same for strimmers and ride-on mowers — particularly dangerous because you cannot retreat quickly.

How big is a typical ground nest?+

By August a ground colony of 3,000-5,000 workers is normal. Underground nests can be larger than aerial nests because the soil cavity can be excavated as the colony grows. The largest UK ground nest on record contained 250,000 wasps.

Will pouring boiling water down the hole work?+

No. The nest cavity is typically 30-60cm below the surface and water cools rapidly in soil. The wasps deeper in the nest are unaffected. Meanwhile the surface workers come out of every available exit (ground nests often have multiple) and attack.

What about decking nests — do you have to lift the boards?+

No. We treat at the edge of the decking where wasps are entering and exiting. The colony is rendered inactive within 2-4 hours. Decking boards never need to be lifted.

Will treatment kill bees in the garden?+

No. We treat the wasp entry point directly. Honey bees, bumblebees and solitary bees do not visit wasp nest entrances and are unaffected. We never treat a bee colony — call a beekeeper instead.

Wasps in your garden? Call 01727 789571 or 0800 046 3473. Same-day service across Hertfordshire and North London. Fixed price from £99.