Friday is National Public Gardens Day, a day to explore and support public gardens.

Some public gardens will have special events and activities Friday. Some will offer free or reduced admission.

The day is an annual celebration “to raise awareness of the important role botanical gardens and arboreta play in promoting environmental stewardship, plant and water conservation, green spaces, and education in communities nationwide,” according to the American Public Gardens Association’s website. Started in 2009, the day is the Friday before Mother’s Day.

Hershey Gardens is offering half-price admission to the gardens and the butterfly atrium with this voucher.

Welkinweir, a site in Pottstown will have free admission and open the estate house Friday from 9 a.m. to 2 p.m. The grounds are open from 9 a.m. to 4:30 p.m. and there's a free bird walk Saturday at 8 a.m.

Tyler Arboretum in Media is offering free admission, crafts for kids from 10 a.m. to noon and a rhododendron stroll from 10 to 11:30 a.m.

Mt. Cuba Center in Hockessin, Delaware will have reduced admission ($5 for adults and $2 for children ages 6 to 17). The site has family-friendly programs from 10 a.m. to 2 p.m., guided walks for $2 per person and will give away free Blue Moon woodland phlox, a native plant.

You can find a full list of participating sites at www.nationalpublicgardensday.org.

Closer to home, you can visit Tanger Arboretum, at LancasterHistory.org, 230 N. President Ave., Lancaster. Admission to the arboretum is free.