A native tree, Cornus Florida will grow to 20' to 30'. Baltimore City, County and Harford County are mounting a campaign, "The Growing Home Campaign." Purchase a tree and receive $10 off the price if the tree retails for over $25. Trees help save on energy costs: 15% to 30% in the shade for summer air-conditioning, lower cold winter winds heating by 30% and increase the value of a home by as much as 15%. How lucky can we be to have inherited three white dogwood trees. Their four white bracts (petals) of the flower sail in the spring wind.