Ar the Wren's Nest, lilac season begins with the Persian variety. In our area, it blooms along with dogwood, redbud, white violet, daffodils and ornamental quince. This rainy spring, a French lilac joined the Persian--a first since it was planted five years ago. Soon the Japanese, Russian and Canadian tree varieties will follow suit. Their ephemeral beauty makes the fragrant blossoms even more precious.