This video from the USA says about itself:
Coral Restoration Foundation, Planting staghorn corals
5 October 2013
From Wildlife Extra:
1,600 Corals planted at Florida Keys Plantapalooza
To celebrate World Oceans Day divers from the Florida Keys-based Coral Restoration Foundation has planted 1,600 corals in the Florida Keys National Marine Sanctuary. Some 70 divers sowed corals at six Upper Keys sites including Molasses Reef, Carysfort Reef, Grecian Rocks, Little Conch Reef, Snapper Ledge and Pickles Reef.
“It’s really important to get the corals out there in large amounts, but it’s also important because we’re involving a lot of the community,” said Kayla Ripple, the Coral Restoration Foundation’s coral nursery programme manager.
Staghorn corals are threatened, but Coral Restoration Foundation has had good success in cultivating and planting new staghorns where the species has died.
The small coral fragments were grown in a designated nursery about three miles from the Keys. The infant corals, about three inches long, are hung on a framework of PVC pipe resembling a tree to develop. After nine months, the staghorns typically reach the size of a dinner plate and are transported to offshore reefs where they are affixed to the sea floor with epoxy.
Since Coral Reef Foundation’s launch in 2000 the organisation has planted some 31,500 corals on upper and middle Keys reefs, however this is the organisation’s most prolific output in a single day.