Black Mamba Petunia Care Guide

Rare colored black velvety flowers stand out against green foliage and add elegant, dramatic color to your garden. He reminds us of a dashing prince in his tux waiting for his princess in the moonlight!
Download Care Card
  • Light : High

    Inside overwintering: Keep in bright light (between 5-8000 foot candles). Outside: After the last frost, plant in spring when the soil temperature is at 70°F in full sun (6-8 hours).

  • Water : Medium

    Allow these petunias to dry a bit between waterings. Avoid long periods of wilting or wet soil. Soggy soil will cause Botrytis and root diseases. Water early in the day at the root level to let the leaves dry before dark.

  • Humidity : Medium

    Average humidity of 40-50% is fine for this plant.

  • Temp : 52℉ - 75℉

    The petunia prefers daytime temps between 58°F and 75°F and night time temps between 52°F and 62 F.

  • Zone : 9|10|11

    Treat this plant as an annual in certain parts of the country or overwinter in a greenhouse.

  • Fertilizer : Weekly

    Water with a balanced fertilizer each week of 8-8-8 or 10-10-10 or a specially formulated petunia fertilizer to help the petunias thrive and bloom.

  • Repotting : Yearly

    When receiving your plant, plant her in the outside container or gardening beds in drifts for colorful embellishment. She'll also be volumptious in a hanging basket. Plant when temperatures reach above 57°F at night or when the soil is consistently at 70°F during daylight hours.

  • Cleaning : As needed

    No maintenance is needed here. She's self-sufficient, self-cleaning, and heat tolerant, making it one of the easiest annuals to have in the garden!

  • Propagation : Cuttings

    Stem Cutting: Water the mother plant the night before to hydrate all the stem ends. After adequate growth on the main plant, take a cutting, using sharp pruners to remove a tip measuring 3-5 inches. Remove any flowers or buds. Before dipping the end into rooting hormone, remove the leaves closest to the end that will be down in the soil. Moisten a half mixture of indoor potting mix and perlite. Poke a tiny hole in the planting mix and plant the stem, then tamp the soil down around it to secure it. Place a clear plastic bag loosely around it to help it root faster and maintain higher humidity levels. Water and mist the plant often to keep the soil consistently moist while it roots. Place the cutting in medium indirect sunlight. After 4-6 weeks, the roots should establish. Acclimate the petunia to normal light conditions a few hours a day, starting in the morning light and progressing each day over a two to three-week period. Transplant your new petunia baby into rich garden soil in a sunny spot. Begin to fertilize at this point and watch it grow and bloom!