Heuchera 'Mint Julep' (Coral Bell) - Another photo showing a close up view of the leaf - Height 15”, Spread 15, Zones 4-9. Full Shade-part sun, although grows best in shadier areas. Fast Grower. Leaves start out lemon lime green then change to mint green - green-silver with dark green veining. Veins are red in the winter. White flowers. Fast growing Heuchera. Better too dry than to wet.