Heuchera Seeds - Purple Palace2nd Year Maturity. Purple Palace heuchera seeds 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 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