Grafting & Propagation Protocol comparison • No healing countdown

Graft Union Temperature Check

Record a union-temperature reading in Fahrenheit and Celsius, and check it against the target band in your propagation protocol.

Enter your details

35°F (Cold) 62°F 95°F (Extreme)

Enter the target band from your crop-specific protocol. The starting values below are an example, not a universal optimum.

Measure the graft-zone temperature
Measure the graft-zone temperatureA thermometer or probe should measure the relevant graft-zone temperature. Use the target range from a species-specific protocol and monitor it; air temperature or a heating-mat setting alone does not establish the temperature at the union. This diagram specifies no universal target.Original illustration · Not a field-test photographView full size Download SVG

How this tool works

The comparison subtracts your supplied protocol limits from the measured union temperature. It does not calculate a healing date. Crop, method, moisture, material condition, root activity and bud movement affect the outcome.

Assumptions & Physical Constraints:

Measure at the union with a suitable sensor. The crop selection labels the record; it does not silently select an unverified universal temperature optimum.

Example: a 62°F reading is 16.7°C. Compared with a user-entered 55–65°F protocol, it is within the entered band; this does not establish that a union has healed.
Rule-set status: Interface/model revision 4.2.0 • September 6, 2026. Sources and limitations below; this date is not a field-trial date.
Sources and model basis: UC ANR Publication 21563 (Propagating Temperate Fruit & Nut Trees) • Hartmann & Kester’s Plant Propagation (9th Ed., Chapter 12: Physiological Basis of Callus Union Formation).

Relevant supplies for this task

Optional, intent-matched links only. Confirm the exact model, dimensions, seller, availability, and current terms on the destination page.

Inkbird ITC-308 Dual-Stage Digital Temperature Controller

Precision Thermostat
Check the exact model manual for voltage, load rating, permitted moisture exposure, sensor placement and calibration.
Affiliate link to Amazon. Verify the exact model on the destination page. Search Inkbird ITC-308 on Amazon →

Commercial Waterproof Horticultural Heat Mat (20" x 20")

Bottom Heat Element
Retailer search, not a tested model. Confirm intended use, power rating, controller compatibility and moisture restrictions.
Affiliate link to Amazon. Verify the exact model on the destination page. Search Seedling Heat Mats on Amazon →

Frequently Asked Questions

Can temperature predict when my graft will heal?

No. Inspect the union and the plant. This tool deliberately does not give universal completion days or lethal-temperature thresholds.

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