 Considerable additions and expansion of the Garden took place from the 1960s onward.A recent expansion effort is the James and Delight Allen Education Center, designed by architect Frank Harmon, the first LEED Platinum certified state-owned building or public museum in North Carolina.Today the Garden comprises 14 collections and display gardens, containing some 5,900 accessions representing about 2,500 species of the 4,700 plant species known to be native or naturalized in North and South Carolina.