Walnuts are round, single-seeded fruits that grow on walnut trees. They have a hard shell that’s enclosed in a green husk. The nut inside the shell is edible and contains oil.
Walnut tree
- Leaves: Pinnately compound, meaning they’re divided into several feathery leaflets
- Flowers: Yellow-green catkins that droop
- Bark: Smooth and olive-brown when young, developing fissures and fading to silver-grey with age
- Twigs: Stout, green, and curving
- Growth: Deciduous broadleaf tree that can grow to 35 meters
Walnut fruit
- Shape: Round, globular
- Color: Brown, wrinkly shell enclosed in a green husk
- Ripening: Ripens between September and November in the northern hemisphere
- Husk: Becomes brittle and turns dark brown to black as the fruit ripens
- Shell: Usually has two segments, but can also have three or four
- Kernel: The edible seed, usually in two halves separated by a membranous partition
Walnut health benefits
- High in omega-3 ALA fatty acids, which support heart health
- One of the richest dietary sources of antioxidants, including ellagic acid, ellagitannins, catechin, and melatonin
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