2nd-year maturity. Heuchera sanguinea. Purple Palace Heuchera Seeds. Non-GMO, open-pollinated, Premium Quality Seeds, Perennial. Open Pollinated. Purple Palace, or heuchera seeds, also known as coral bells, grow a vigorous Pacific Northwest favorite ideal for many moderate and humid gardens across the country. Purple Palace seeds boast one of the most tolerant and decorative perennials with their unique 3-5 inch iridescent-tinted leaves perfect for an exotic trim along walkways, fences, or filling out the flower bed. Heuchera is native to the tame winters along the Pacific and will provide year-round brilliance in similar climates. Purple Palace heuchera provides a unique and stunning planting for many residential and commercial spaces. Pelleted Seed.