2nd Year Maturity. Melting Fire heuchera seeds are a simple, durable, yet vibrant grow ideal for many temperate and moist gardens. Melting Fire seeds mature into 10-15 inch tall clumping mounds boasting deep shades of red, burgundy, and merlot perfect for trimming a walkway, border, fence, or patio. Melting Fire heuchera is native to the Pacific Northwest's warm, humid winters and will thrive perennially in many similar gardens. Melting Fire seeds mix well in rock gardens, slopes, riverbanks, and anywhere other plants may fail to establish.