Type
thornless Marion mutation
Marionberry variety
Willamette Thornless Marion Marionberry
A thornless mutation of Marion selected for fruit with the familiar Marion flavor profile. It offers a more comfortable picking experience while retaining trailing growth.
Season
mid summer
Best for
home gardens, preserves
About Willamette Thornless Marion
Willamette Thornless Marion is a thornless marionberry-type selection with dark, flavorful blackberry fruit. Its spineless canes make it more manageable than prickly trailing blackberries.
Growing Willamette Thornless Marion Marionberry
Use a trellis and prune as a floricane-fruiting trailing blackberry, removing the old canes after picking. Pick only fully black fruit, as flavor develops late in coloring, and protect ripening berries from gray mold in wet weather.
Full growing guide
For planting, care, pollination, and harvest that apply to all marionberry, see the complete guide.
How to grow MarionberryOther marionberry varieties
Variety characteristics are general guidance for US home gardens; chill hours, hardiness, and pollination vary, so confirm suitability for your zone. Availability differs by supplier. Page updated Aug 4, 2026.