Quercus faginea Seeds | Portuguese Oak
LATIN NAME: Quercus faginea
COMMON NAME: Portuguese Oak
Plant Profile
Portuguese oak is the oak of the Iberian hills, a tree of ten to twenty metres whose leaves are semi-evergreen, hanging dry and brown through winter and falling only when the new growth pushes in spring. The crown is broad and rounded, the bark grey and finely cracked, and the acorns ripen in a single season, which separates it from most of its relatives. It is a tree of limestone, of hot dry summers and cool wet winters, and it is one of the few oaks that will grow well on thin chalk. Old trees are often pollarded, and the regrowth makes a dense, dark canopy. The leaves are leathery, oblong and shallowly lobed, dark above and grey beneath, and they rustle rather than fall in autumn.
Science & Biotechnology
Quercus faginea sits in the white oak group and is one of the few European oaks with a short acorn cycle, maturing in one year rather than two. It hybridises freely with Q. robur, Q. petraea and Q. pyrenaica wherever they meet, and Portuguese populations show extensive introgression, which has made the species a test case for oak genomics. Its marcescent habit, holding dead leaves through winter, is thought to protect buds from frost and to deter browsing. Provenance trials show clear differences in drought tolerance between Portuguese and Spanish sources, and the species is now planted in restoration work on dry Mediterranean margins. Its acorns are also a minor source of oil in parts of Portugal.
Uses & Benefits
The acorns are sweet enough to be eaten by livestock, and in the dehesa and montado systems the tree contributes to the autumn pannage that finishes Iberian pigs. The wood is hard, dense and excellent for charcoal, tool handles and small construction, and the bark has been used in tanning. In the garden it is a long-lived shade tree for a dry, calcareous site, tolerant of heat and wind, and its leaves hold through winter, which gives a screen when deciduous oaks are bare. It is slow, but it is steady, and it does not ask for water. It is also used in truffle plantations in Spain, where it is inoculated with Tuber melanosporum and managed as a low-density orchard.
Growing from Seed
Sow acorns as soon as they fall, because they lose viability quickly once dry; a float test removes the hollow ones. Plant them two to three centimetres deep in a deep pot, since the radicle goes down first and resents disturbance. Keep the pot outdoors through winter and expect germination in early spring. Grow the seedling in full sun for two seasons before planting out, and protect the taproot by planting young. It tolerates limestone, drought and wind once established, but not waterlogging or deep shade. Young trees are slow for the first three years and then double their rate once the roots are down.
Our Take
A southern oak for dry, chalky ground, holding its leaves through winter and its reputation for patience. Give it sun and lime, and it will outlast the garden.
Related Reading
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