"dense greenery" is a correct and usable phrase in written English.
You can use it when describing a heavily forested area, or a garden filled with plants and trees. For example, "The mountainous landscape was hidden beneath thick layers of dense greenery."
And the light sea breeze gently caressed the dense greenery of the normally peaceful village of East Hampton.
Even such magnificent viewpoints as Camden and Lansdowne crescents are now interrupted by dense greenery growing up from below.
Its 32 rooms – some sturdy cement-walled buildings and some wooden cabins – are tucked into dense greenery, for privacy.
Amid the dense greenery of the jungle, throbbing with the hum of insects, the young boy lifts his arm and points: the creature was there.
This being Hawaii, Paia also has all the dramatic beauty you would expect from the South Pacific — dense greenery, powdery beaches and world famous waves.
The attached beer garden, decorated with exposed bulbs and dense greenery, looked so intriguingly out of place that my friends and I stepped in without thinking.
Then the vultures would soar over the dense, tangled greenery to the walls of the chosen Tower of Silence, a stone amphitheater where the corpse was to be laid.
The next morning I drove two hours west across the island on dramatic, winding Saddle Road, which takes visitors from dense lowland greenery to a high plains landscape dotted with cows and sheep-crossing signs, and on up to a lava-field landscape bookended by two massive volcanoes, Mauna Kea and Mauna Loa.
From the lazy serenity of the Swan Lake, to the dense, humid greenery of the rainforest zone, to the carefully pruned bonsai and orchid gardens, careful landscaping sits side by side with huge old trees that first poked their heads above ground when Queen Victoria was surveying her Empire.
She likes the garden to be dense with greenery at all times and in all locations.
They're all submerged in dense, and public, greenery, rather than placed behind paved-over front gardens.
