Tree alphabet

I'm about three years late learning about this, but did you know that there is a New York City Tree Alphabet, a font you can download? NYC Parks Department artist-in-residence Katie Holten designed it with the silhouettes of "existing native and non-native trees, as well as species that are to be planted as a result of the changing climate." Hence 

Ash, Birch, Crabapple, Dawn redwood, Elm, Flowering dogwood, Ginkgo, Hawthorn, Ilex, Juniper, Kentucky coffeetree, Linden, Maple, Nyssa, Oak, Persimmon, Quaking aspen, Redbud, Sassafras, Tulip tree, Umbrella pine, Virginia pine, Willow, Xanthoxylum Americanum, Yellowwood, Zelkova 

You could potentially plant secret messages, discernible only to those with the key. In the meantime, can you decipher my message above?