Like other petunias, plant “Black Velvet” petunias in an area of the garden that receives full sun and has rich, well-draining soil. Petunias need regular water and will quickly fade in dry soil. Feed your petunias a balanced fertilizer once a month or provide a slow-release fertilizer when you transplant them outside.Click to see full answer. Likewise, how do you take care of black petunias? Care Petunias are tolerant of heat so you don’t have to water them regularly. A thorough watering once a week should be sufficient (unless there are prolonged periods of drought in your area). Fertilize your plants monthly to ensure good growth. Remove faded/dead flowers to prolong blooming. Similarly, are black petunias rare? Stuart Lowen, from Ball Colegrave in Banbury said: ‘It’s completely unique. It’s the first black petunia anywhere in the world. ‘It’s rare to get a flower as black as this – very seldom do you get anything this dark. Regarding this, are there black petunias? “The black colour did not exist in petunias before, so it has to come from the right recombination of a novel color mutant and multiple regular color genetic backgrounds,” she said. Thus the dramatic new flowers are the result of patience, experimentation, and pollenation, rather than any genetic modification.How do I make my petunias bigger? Keep petunias bushy to maintain their looks and keep them blooming. Move container-grown plants into the yard in the morning and back onto the porch in the afternoon so they receive at least five to six hours of beneficial morning sunlight. Pinch grandiflora and multiflora petunia seedlings back when you plant them.
