Available Now!! Royalty Purple Raspberry The most popular and sweetest purple raspberry. Developed at The Geneve Experiment Station in New York. Very productive, large high quality berries with good flavor. USDA Zone 4 - 8. Very winter hardy, late summer, red berries turn a soft purple when ripe. These plants are huge dormant bare root 2 year old plants. This size you would see in a garden center in 1-2 gallons containers. They were originally 3+ foot tall, but have been pruned back to promote branching. Plants come with detailed planting, growing and care instructions...and you can call or email if you have additional questions.