Alcea rosea 'Nigra'

The original black (dark purple) hollyhock.  The contrast between foliage and flower is what gives this stellar short-lived perennial its crown in the garden.  The blooms are amongst the deepest color in the plant world and are borne abundantly throughout the summer months.  A true beauty by itself or gingerly mixed within the landscape.  You can plant en masse (large groups) but the color is enhanced when used to compliment other colors within the landscape.  Plant next to scarlet reds, deep blues, or even oranges for best pop.  Go crazy next to white flowering plants to create a classic checkerboard look. :)
Mature Plant Size: 5'-6' Tall, 3' Spread
Bloom Time: June-August 
Light Exposure: Full Sun  
Soil Type/pH: Well-drained/6.0-7.5 
Hardiness Zones: 3-9
Fertilizer: If using compost apply an 1" at planting time and side dress annually in late fall or early spring.  If using a granular fertilizer, we recommend organic formulations, apply an all-purpose formula in early spring annually.  It is only recommended to use liquid fertilizers when the growth is slow, and this is not normally needed. 
Container Size: 4.5" Pot