50 Hollyhock Seeds - Golden Yellow Hollyhock, Large, Fully Double Yellow Flowers GOLDEN YELLOW Hollyhock Seeds Large, fully double yellow flowers. Grows nicely with 'Milkmaid' Butterfly Weed. Sturdy 4-5' spikes of ruffled fully double yellow flowers open from the bottom up all summer. Does best in full sun. Attracts butterflies and hummingbirds. Height: 4-5 Feet Tall Spread: 18-24 Inches Wide Color: yellow flower Light: Full Sun Zone: 3 How to Plant HOLLYHOCK Seeds Sow hollyhock seeds in 2 inch pots or cell packs, press into soil and lightly cover. Kept at 70-75 F., germination is in 14-28 days. Can direct sow into prepared seed beds in groups of 3-4 seeds, spaced 2-3 feet apart. Thin to strongest plant.