The phrase "a string of green" is correct and usable in written English.
It can be used to describe a series or collection of green items, such as plants, lights, or any other objects that are green in color.
Example: "The garden was filled with a string of green, as the vines climbed up the trellis and the leaves shimmered in the sunlight."
Alternatives: "a line of green" or "a series of green".
He looked at a string of green, blue, gray, brown and pink toilets.
The park is part of a string of green spaces in the city on both sides of the Oldman.
The deal comes hot on the heels of a string of green energy investments by the famous investor.
The attack was the latest in a string of "green on blue" attacks in which Afghan security forces have turned their guns on their international colleagues or mentors.
The YHA has established a string of "Green Beacon" hostels that deploy 21st-century technology to environmental effect – including the former village school in Lockton in the North York Moors, which has everything from solar panels to composting toilets.
KABUL, Afghanistan — Three NATO soldiers were shot to death on Monday in two separate confrontations involving Afghan security forces, officials said, adding to a string of "green on blue" killings that have complicated the relationship between Afghanistan and its Western allies.
BERLIN — A string of Green Party victories and strong electoral showings across Germany, from the conservative south to the port cities of the north, are helping to redefine politics among voters who are increasingly losing faith in the more established parties.
Or causing a string of sequential green lights -- an unheard of event in Seattle traffic -- to help a new driver avoid the hill starts.
If he had been trying to kill the Marines, possibly in a botched suicide attack, the episode could have been another in a recent string of "green on blue" attacks in which Afghan security forces have turned on their American or coalition partners in Afghanistan.
Designed to occupy the Shenzhen Bay area on China's mainland, directly across from the microcosm that is Hong Kong, China's steadily worsening pollution problem, Cloud Citizen is the latest in a long string of green architectural projects and art pieces the Asian superpower has hosted over the last two years.
Amber Rudd has been accused of "grotesque hypocrisy" today for claiming the government is leading on climate change while overseeing a string of attacks on green policies.
