dark green is not in our dictionary (yet). Here's what it could mean:

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adjective

A deep shade of the color between blue and yellow in the visible spectrum, similar to the hue of forest foliage or emeralds.

Examples are provided to illustrate usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

They offer a glimpse of what has been lost, with resilient shrubs painting the rolling hills dark green.

From Barron's • May 31, 2026

The oblong ugly vegetable with lizard-like ridges is dark green, holding secrets, grows on thin vines.

From Salon • May 9, 2026