The Penta plant, perhaps more commonly known as the starflower, gets its nickname from its orbital clusters that stand upon tall stems under green foliage. You can find Pentas in a range of colors, including red, lavender, pink and white. Flowering just as spring turns to summer and staying around through the seasons until the first frost, the Penta draws in lovely butterflies and the occasional bee. Despite its classification as a perennial, most gardeners raise Pentas as annuals in areas with winter frosts.
Once you have your Penta, you must decide on the right spot to plant it. Spread out 4 inches of compost on the garden bed in an area with full sun exposure. Put down 12-6-6 fertilizer on top of the compost, incorporating into the top 10 inches of soil. Take the Penta out of its pot and plant in the bed at a depth matching their placement in the planter. If you're planting multiple pentad, give each about a foot and a half radius. Water your Pentas about twice per week in the first month after planting, keeping the soil moist about a half a foot below ground; after the Pentas establish themselves, you'll only need to water them when you go more than a week without rain. Pinch off the top half inch of each stem tip once you've planted, and then pinch again two weeks later; this will force lateral branching and lead to fuller growth. Fertilize once per month throughout the summer and give them a 10-10-10 fertilizer blend. With these steps, your Pentas should grow up to be healthy plants!