Cut flower season extension operations checklist

What to take away

• Approve a structure only after defining the crop, market week, price, and weather risk.
• Design for local wind, snow, drainage, safe access, and daily ventilation.
• Treat protected soil, water, fertility, and pests as a separate production zone.
• Write frost and heat actions with triggers and responsible people.
• Compare extra margin with capital, cover, energy, and labor costs.

Use this checklist for row cover, low tunnels, high tunnels, or a protected block within a greenhouse. Manufacturer instructions, engineering requirements, electrical and fire codes, pesticide labels, worker-safety rules, and local permits take priority.

Business case

• Name the crop and cultivar.
• State the target first and last sale weeks.
• Confirm expected buyer, product form, quantity, and price.
• Estimate marketable stems without protection.
• Estimate added marketable stems or quality from protection.
• Price structure, shipping, site work, cover, hardware, and installation.
• Add yearly plastic, repair, fuel, power, and labor.
• Set a minimum margin or payback criterion.
• Define the result that would stop expansion.

Site and structure

• Confirm land control for the structure's useful life.
• Check permits, setbacks, utilities, and program conditions.
• Evaluate wind direction, exposure, snow load, and anchoring.
• Direct roof and site runoff safely.
• Maintain emergency and equipment access.
• Confirm door width for harvest carts and materials.
• Plan bed orientation and worker paths.
• Protect plastic from sharp edges and abrasion.
• Install approved bracing and anchors.
• Record cover material, date, and expected replacement.

Crop schedule

• Confirm the crop responds to the intended protection.
• Set sowing, transplant, and target harvest dates.
• Account for day length as well as temperature.
• Choose early, middle, or late cultivars from regional evidence.
• Add an uncovered comparison planting.
• Reserve backup transplants or a replacement crop.
• Set a last useful planting date.
• Plan crop removal and the next occupancy.

Utah State University trials summarized in its snapdragon cut flower production report found that marketable stems changed with planting date, cultivar group, and high-tunnel versus field setting. The results are specific to Utah conditions, but they show why a protected schedule must be tested by crop and date rather than assumed.

Irrigation and soil

• Give the protected block an independent valve and record.
• Install backflow protection, filtration, and pressure control as required.
• Test distribution before planting.
• Place moisture checks at dry, wet, edge, and center zones.
• Sample tunnel soil separately from open field.
• Monitor soluble salts where rainfall does not leach beds.
• Track all fertilizer and compost by tunnel area.
• Prevent irrigation water from wetting packed flowers or walkways.

Ventilation and heat

• Put thermometers at crop height and in likely cold or hot zones.
• Set opening and closing triggers.
• Assign daily checks, including weekends.
• Confirm roll-up sides, doors, vents, and fans move freely.
• Secure movable parts for wind.
• Install shade cloth only at a documented density and time.
• Keep a safe response for failed controls or power.
• Log minimum and maximum temperatures.

Frost response

• Monitor an authoritative local forecast.
• Know crop thresholds by stage.
• Inventory dry covers, hoops, weights, and repair supplies.
• Test backup heaters and alarms where present.
• Follow fuel, combustion-air, clearance, and fire rules.
• Deploy covers early enough to trap stored heat.
• Prevent damaging contact with blooms where needed.
• Assign a morning ventilation and cover-removal check.

University of Minnesota Extension's review of row covers for frost protection explains that fabric weight changes protection and that covers should be applied before freezing conditions to trap heat. Its crop thresholds concern strawberries, so use flower-specific thresholds for cut crops.

Pest and disease scouting

• Inspect incoming plants before entry.
• Scout undersides, flowers, sticky cards, and weeds.
• Record pests by location and date.
• Keep vegetation clear around structure edges where appropriate.
• Manage humidity and leaf wetness.
• Remove diseased material through a defined route.
• Verify every pesticide is labeled for crop and protected setting.
• Follow reentry, ventilation, posting, and protective-equipment rules.

Daily opening checklist

• Read overnight minimum.
• Inspect cover, anchors, doors, and vents.
• Check irrigation pressure and leaks.
• Read canopy temperature and humidity.
• Vent according to trigger and forecast.
• Scout a rotating set of beds.
• Check crop support and path safety.
• Record exceptions and assigned repairs.

Seasonal closeout

• Total marketable stems by planting date.
• Record first and last harvest.
• Total crop loss by cold, heat, pest, and disease.
• Total cover, fuel, power, repair, and labor cost.
• Compare extended-week price and sell-through.
• Inspect frame and anchors.
• Store reusable covers dry and labeled.
• Test protected soil before repeating inputs.
• Approve, modify, or stop the next cycle.

Common questions

How often should a high tunnel be checked?

Often enough to keep temperature, wind, water, and crop risk within the operating plan. Sunny or volatile days can require several checks.

Can a forecast replace an inside thermometer?

No. The protected environment can differ sharply from official air measurements, especially in sun, calm conditions, and at crop height.

Should tunnel soil receive the same fertilizer as the field?

Not without separate tests and crop records. Water movement and salt accumulation differ under cover.

Is plastic replacement a capital cost or operating cost?

Accounting treatment varies. In production analysis, include its expected life and replacement cost so stems bear the real expense.