| Common name | Fir (Noble) |
|---|---|
| Scientific name | Abies procera |
| Storage characteristics | Intermediate (?)a |
| Storage moisture content and temperature | 9-12% @ < -5°Ca |
| Dormancy characteristics | Shallow |
| Pretreatment method | 8 (6-12) weeks cold (c. 4°C) See pretreatment of shallowly dormant species |
| Efficacy of pretreatment / remarks | Generally effective, a significant proportion of live seeds should germinate |
| Approximate date to initiate artificial pre-treatment (for 1 March sowing) | 4 January |
Footnotes
Storage characteristics
Intermediate - seeds that can only be partially dried or need very slow, careful drying. They deteriorate more quickly than 'orthodox' seeds but more slowly then 'recalcitrant' seeds.
Orthodox - seeds that can be dried without harm, and once dried can be frozen, stored for years with little deterioration and relatively easily revived.
Recalcitrant - seeds that cannot be dried or frozen and are therefore short-lived.
(?) - indicates storage characteristics are not yet fully understood.
a Maximum advisable storage c. 3years @ c. 10% moisture content & -10°C
Pre-treatment method
Figures in brackets indicate that different seedlots often require different pretreatment durations. There are three potential courses of action:
- Adhere to the pretreatment duration in bold, with the knowledge that the maximum potential germination of the seedlot may be sacrificed for the sake of simplicity.
- Inspect the pretreating seed regularly. Sow when c. 10% of seed is chitted, with the hope that this is indicative that the remaining seeds are now close to germination.
- Inspect the pretreating seed regularly. At suitable intervals, remove chitted seeds (by hand, flotation, and/or sieving). Sow chitted seeds and return balance to pretreatment until no more seeds germinate.
Practice Guide
Raising Trees and Shrubs from Seed (PDF-648K)
Forestry Commission Practice Guide 18.