Quercus robur. The mighty oak stands 30+ meters tall and embodies morale, strength and wisdom. Nuts are large (2.3-3cm long) and lower in tannins than red oaks, which make them more rewarding to go to the work of cracking and leaching the tannins to use them as a flour/food source. The wood is popular in barrel and cask making thanks to its elastic yet durable strength, and resistance to rot. Very long-lived trees, these majestic beauties can grow up to the ripe old age of 450 years old.