I have tried several varieties, including regular old petunias and the 'Wave' varieties. These quarter-inch-long garden pests have soft pear-shaped bodies in various shades of white, black, yellow, green, brown, or red. My big beautiful chive plant covered in black bugs ahh! These plants technically grow as frost-tender perennials in U.S. Department of Agriculture plant hardiness zones 10 through 11, although most people treat them as annuals. Spider mites appear as tiny moving dots to the naked eye and are roughly four times the size of cyclamen mites, which are invisible without a magnifying glass. If you look closely at the photo insets at left, you'll see just a hint of very dark burgundy/purple in the upper right corner in the 'Black Velvet' inset. Here are the most common insect pests that you’re likely […] As with other "black" flowers, someone is bound to point out that the color is not truly black. Of the thousands of insect species that call your plants home just a handful pose problems for gardeners. Perhaps the easiest home remedy for aphids on petunias outside is to spray the undersides of the leaves with a strong stream from your garden hose. Petunias host two basic types of mites known as spider mites and cyclamen mites. Thank you! Cat holland on May 09, 2015: As soon as I sprayed.. Some may have a waxy or woolly coating. 2. I've never used this on 'tunias, but I've used it on lots of other plants - try it on one stem first: 50:50 mix of 70% isopropyl (rubbing) alcohol:water with about 6 drops of dishsoap per quart. The subsequent blooms of petunia 'Black Cat' began to unfurl and they were black. Petunias (Petunia x hybrida) make showy additions to flowerbeds, hanging baskets and pots or containers. Some things had to be moved around the porch garden and I moved the petunias purported to be 'Black Cat' to a spot where they got shade from the harsh full sun of the porch garden. Shake the bottle to combine thoroughly. Let me be among the first, regarding these petunias. Some Things to Consider before Growing Black Petunia in Your Garden needpix.com These pests pierce the leaves of petunias … Thank you for the information it will be put to use. They have pear-shaped bodies with long antennae; the nymphs look similar to adults. Ensure the spray of water hits both the bugs and the affected area, then rinse the plant with water. By far, most insects you see on your plants are benign, or even beneficial, so carefully identify an insect before deeming it a pest to be controlled. Just a guess: bugs = aphids, black spots = sooty mold or other fungal pathogen . Additionally, nasturtiums may draw harmful cabbage moths, thus saving your tender cabbage, kale, broccoli and other brassicas. 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