The Workforce You Rent by the Box
In greenhouse tomato, pepper and strawberry production, pollination is a production line — and for most modern operations the workers are bumblebees. At full season a hectare of tomatoes needs tens of thousands of flower visits a day, every day, for months. Get pollination right and fruit set, size and shape follow. Get it wrong and you see it in the grading line as catfacing, small fruit and missed set — weeks after the cause.
This guide covers bumblebee pollination greenhouse management at commercial scale: stocking, placement, worker safety and how to read a hive’s performance before it costs you fruit.
Stocking: The Numbers That Matter
| Crop | Typical stocking | Replacement cycle | Notes |
|---|---|---|---|
| Tomato (long season) | 6–10 hives/ha standard; up to 12+ under high light | Every 6–8 weeks in season | Bigger hives/quad boxes reduce visit frequency |
| Pepper | 4–8 hives/ha | 6–10 weeks | Lower flower density than tomato |
| Strawberry (greenhouse) | 4–8 hives/ha | Shorter, pollination peaks with planting | Timing with flowering waves matters more than raw count |
| Seed crops | Project-specific | Matched to bloom window | Ask the supplier for a bloom-window plan |
Treat these as planning figures and refine with your supplier against variety, light level and house layout. The mistake to avoid is buying one number for the whole season — flowering density changes, and the order plan should change with it.
Placement Inside the House
- Distribute: hives spread across the house, not banked in one spot — bees forage locally
- Height and shade: on stands or pallets, shaded from direct sun, entrance visible and unobstructed
- Avoid aisles: entrances away from main worker routes — stings come from collisions, not malice
- Mark on the layout: hive positions belong on the farm map; a lost hive is an unmanaged hive
- Protect from sprays: close hives before any pesticide application, observe label bee-safety intervals
Reading Pollination Performance
The hive tells you it is failing before the fruit does, if you check:
- Flight activity at the entrance on a fine day — steady traffic in and out is baseline health
- Tomato bruising: flowers visited by bees show characteristic brown bruise marks on the anther cone; sample flowers weekly and look for the marks
- Fruit set and shape by truss position — poor set low in the plant with good set higher suggests a timing problem, not a stock problem
- Deformed fruit rate on the grading line, tracked weekly — the lagging indicator that confirms a shortfall weeks old
Shortfall responses are simple: add hives, redistribute them, or fix the environment. Bees fly less in low light, extreme heat and high humidity — an environment problem that looks exactly like a bee problem.
Working Alongside People
- Brief staff on behaviour around hives: no swatting, no blocking entrances, gentle movement near flight paths
- Locate hives away from doors, break areas and packing lines
- Keep an epinephrine plan for allergic staff, as with any site risk assessment
- Contractor coordination: any spray work in the house closes hives first
- Record deliveries, colony condition on arrival and closure events — auditors and buyers increasingly ask
Most farms rent colonies through the season rather than manage their own — the supplier delivers, checks and replaces on a schedule. Choose a supplier who will walk the crop with you and adjust orders to flowering, not just deliver boxes.
Budgeting Pollination Properly
Pollination has a habit of sitting outside budgets because it arrives as small boxes rather than equipment. Bring it inside the crop cost model: expected hives per hectare, replacement frequency, delivery charges, and the labour to place and close them monthly. Then compare it against your value of fruit per truss — the ratio usually justifies itself quickly.
Also budget the interaction costs. Applications that close hives, extra scouting labour during bloom, fine steel wool for grafting tools where relevant, and occasional emergency colony replacement when flowering unexpectedly peaks. Operations that track pollination cost per kilogram of graded fruit tend to manage input quality more actively, and are also the ones able to spot a pollination problem in the data rather than in the rejected pallets several weeks later.
FAQ
Why bumblebees rather than honeybees in greenhouses?
Bumblebees work in the cooler, lower-light and confined conditions of a greenhouse, fly earlier in the day, and buzz-pollinate tomatoes, which honeybees do poorly. Honeybees remain useful for some outdoor and open-field crops.
Can I use electric vibration instead of bees?
Hand or electric vibration works for tomatoes and is used in some regions, but the labour cost at scale almost always exceeds hive rental — and consistency across a big crop is hard to hold by hand.
What reduces bee activity besides hive health?
Low light (winter, dirty covers), very high temperatures, high humidity, drafts at entrances, and pesticide residues. Check the environment before blaming the bees.
How do I know a hive is exhausted?
Falling entrance traffic combined with poor flower bruising and rising deformed fruit is the signature. Suppliers typically replace on a planned cycle before this point — track delivery dates so you know when replacement is due.
Do bumblebees work with biological control programmes?
Yes — the two systems are designed to coexist. The rule is pesticide compatibility: some products are bee-safe when dry, others are not. Coordination between your IPM schedule and hive management is the entire job.
Are there regulations on keeping bumblebees?
In some jurisdictions non-native subspecies are restricted; use approved suppliers who meet local rules. In a few markets, native-only pollinator rules apply to imported colonies.
Pollination Is a Managed Input
Treat pollination with the same planning discipline as fertigation and the fruit set will hold all season. We coordinate hive plans with crop schedules as part of turnkey projects. Start with the quote form.
Related reading: fruit set sits inside the wider crop programme — see commercial tomato production, commercial strawberry gutters, biological control, crop scheduling and greenhouse ventilation.