Evolvulus glomeratus aka Blue Daze

Evolvulus glomeratus is known as Brazilian dwarf morning-glory. It belongs to the morning glory family, Convolvulaceae. Its native range lies in tropical South America. There, it grows in a seasonally dry tropical climate. People have also introduced it to Florida. This tender perennial does not climb or twine. Gardeners grow it as an annual where winters are cold.

Plants form low mounds with stems that spread outward. They reach 0.75–1.5 feet [0.23–0.46 metres] tall. Their spread reaches 2–3 feet [0.61–0.91 metres]. Stems trail down from pots and hanging baskets. They root readily where they touch the ground. Young stems bear fine, pale gray hairs. Older stems turn woody as the plant ages. The green leaves have a soft, gray-haired surface. Their shape ranges from oval to narrow and pointed. Leaves measure about one inch long and half an inch wide. The foliage stays evergreen where conditions allow perennial growth.

Blue flowers have white centers and a funnel shape. Each bloom measures about half an inch across. Flowers grow singly from leaf axils near stem tips. Each lasts just one day, but plants keep making more. The main bloom season runs from June until frost. Flowers close at night and during cloudy weather. Bees and hummingbirds visit the blooms. The long flowering season gives beds color through summer and fall.

Grow this plant in full sun for best results. It needs soil that drains well and contains organic matter. Loamy soil suits it, with moderate, steady watering. Plants also tolerate drought, though regular water supports cultivation. Sources differ on the lower hardiness limit. Missouri Botanical Garden lists USDA zones 9–11. NC State Extension gives the wider range of 8–11. In colder areas, summer cuttings can provide next year's plants. Keep rooted cuttings indoors in a cool, bright spot. Reduce their water while they overwinter.

Use this low plant along borders or in mass plantings. It also suits small ground-cover areas and seasonal beds. Its trailing stems soften pot edges and stone walls. Hanging baskets give those stems room to hang down. The low growth and long bloom season suit these uses. Care needs are low, according to NC State Extension. Both horticultural sources report no serious known pest or disease problems.