Big, bold flowers and foliage give hydrangeas an irresistible appeal that seems to be growing every year.

Several newly popular species and varieties are marketed as ready for partial tofull sun.

But how much sun can hydrangeas actually tolerate, and which varieties are best for your garden?

Pinacle hydrangea

Credit:pcturner71 / Getty Images

pcturner71 / Getty Images

How much sun do hydrangeas need?

Smooth hydrangeas can handle full sun in cooler climates, notes Ryan McEnaney from Bailey Nurseries.

Popular smooth hydrangea varieties include the Incrediball (an improved version of Annabelle) and the Invicibelle series.

Endless Summer ‘Bloomstruck’ Hydrangea flowers

Credit: Kritsada Panichgul

These still come with a caveat, however.

Dappled afternoon shade is still preferred for this species.

“Panicle hydrangeas are the most sun-tolerant hydrangea, Carmolli says.

close up of white and pink flowers on berry white hydrangea

Credit: Courtesy of First Editions Shrubs & Trees

In fact, they like6 or more hours of sun per dayfor optimal performance.

My new favorite is Puffer Fish panicle hydrangea, she says.

Burned flowers and foliage also indicate too much direct sun.