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The acorns ripen in autumn, about six months after pollination. [9] It is a resilient tree that can survive temperatures below −20 °C (−4 °F), and that on occasion reach 47 °C (117 °F). [5] As opposed to Quercus ilex, its acorns have a very low level of bitterness tannins and so are generally sweet and a good energy source for livestock ...
(Arabic: tūrmūs) The seeds are edible after they are first leached by boiling them in hot water, a process that is repeated several times, with the water being discarded after each boil. [117] Blue lupine grows in the mountainous regions of Israel and Palestine, and is a plant protected by Israeli law because of its exquisite beauty. [118]
Knocking down acorn to feed pigs. 1300s England. Mast is the fruit of forest trees and shrubs, such as acorns and other nuts. [1] The term derives from the Old English mæst, meaning the nuts of forest trees that have accumulated on the ground, especially those used historically for fattening domestic pigs, and as food resources for wildlife.
The main page of this article suggests roasting acorns to make them edible. Is this possible? Does roasting have an effect on tannin? Does it make acorns taste less bitter? Or are the acorns still bitter after roasting, but at least the nutrients are more easily digested? 216.99.198.130 07:39, 13 September 2010 (UTC) Perhaps lye?
The acorns are 10–20 millimetres (3 ⁄ 8 – 3 ⁄ 4 in) long and about one-third to one-half enclosed by a cap or cup ; they mature in September, turning from green to golden brown. The plant reproduces from acorns, but also spreads from root sprouts that grow from vast underground structures called lignotubers .
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The acorns, borne in a shallow, thin cap, are hemispherical, 10–16 millimetres (13 ⁄ 32 – 5 ⁄ 8 in) long and 9–15 mm (11 ⁄ 32 – 19 ⁄ 32 in) broad, green maturing pale brown about 18 months after pollination. [7] Unless processed using traditional methods, the acorn is unpalatable because the kernel is very bitter. [citation needed]
The acorns are 2–3 cm (3 ⁄ 4 – 1 + 1 ⁄ 4 in) long, [8] with a moderately sweet kernel, and mature in 6–7 months from pollination. Q. douglasii is monoecious and wind-pollinated. Flower buds take a growing season to develop into catkins. [5] Blue oak pollen is severely allergenic. [12]