Critical Spring Temperatures
The critical control temperatures for apple blossom buds are given in the table below.
- Old standard temperature is the lowest temperature that can be endured for 30 minutes without drainage.
- This table also shows the temperature that will kill 10% and 90% of normal fruit buds.
Critical spring temperatures for apple blossom buds
Apple Stages |
Critical Control Temperatures |
---|---|
Silver tip |
|
Green tip |
|
Half-inch green |
|
Tight cluster |
|
Pink |
|
King bloom
|
|
Full bloom
|
|
Post bloom
|
|
These numbers were taken from WSU Extension bulletins. Portions of these bulletins are posted at Greg Lang’s Fruit Bud Hardiness page at the MSU Horticulture Department.