Description: Blue Angel™ Althea is a deciduous flowering shrub valued as an ornamental accent or general-purpose garden shrub, often used as a warm season focal point or trained into a small tree form in residential and public landscapes. It develops an upright, oval to vase-shaped habit and produces large, single blue, broadly trumpet-shaped flowers with violet tones that cover the plant in generous flushes from midsummer through fall, providing long-lasting color during the warmest months. The flowers have the characteristic hibiscus

structure, with five overlapping petals surrounding a prominent central staminal column, creating a bold, classic hibiscus look that is easily visible from a distance. In gardens, Blue Angel™ Althea is commonly used as an accent plant, in mixed borders, in group or mass plantings, and in large containers where its extended flowering season provides sustained visual interest. The blossoms support garden biodiversity by serving as a nectar source that attracts pollinators and hummingbirds, enhancing activity and ecological value in sunny planting areas. This shrub tolerates a range of soil types and moisture conditions as long as drainage is adequate, shows good drought tolerance once established, and responds well to typical garden care such as periodic pruning and moderate fertilization, making it suitable for both beginner and experienced gardeners seeking a reliable, low-maintenance flowering shrub. 

Propagation & Planting: Plant Blue Angel™ Althea in a spot with full sun or very light afternoon shade and soil that drains well but does not dry out too quickly. Loosen the soil broadly, removing weeds and stones, and mix in compost to improve structure if the soil is very heavy or very sandy. Dig a hole about one and a half to two times wider than the root ball and no deeper than the height of the root ball so the top sits level with the surrounding soil. Gently remove the container, tease apart any circling roots, and set Blue Angel™ Althea in the center so it is upright and straight. Backfill with the excavated soil, firming lightly to remove air pockets without compacting the soil. Water slowly and thoroughly so the soil settles around the roots. Apply a shallow layer of organic mulch, such as shredded bark, around the base, keeping it a small distance away from the stem, to help conserve moisture and moderate soil temperature.

Plant Care: Blue Angel™ Althea does best in full sun and in well-drained soil that stays evenly moist but never soggy. Water deeply about once a week during active growth, and water more often during hot, dry spells or in containers; once established, it is more tolerant of brief dry periods, but regular watering still supports better flowering. In cooler or wetter weather, reduce watering and let the top layer of soil dry slightly between waterings. Use a light layer of mulch to help hold moisture and reduce weeds, but keep it a little away from the stems. Feed in early spring with a balanced, slow-release fertilizer, and avoid heavy late-season feeding. Prune in late winter or early spring before new growth starts, removing dead or crowded stems and shaping only as needed. In containers, use a large pot with drainage holes and check moisture more often, since pots dry out faster than garden soil. During the growing season, remove faded blooms if desired and keep the root area clear of competing weeds or turf.

Fertilize: Routine heavy fertilization is not necessary for Blue Angel™ Althea, because this shrub generally grows and blooms well in ordinary garden soil that has some organic matter. If growth and flowering look normal, you can simply feed once each year in early spring with a balanced, slow‑release granular fertilizer around 10‑10‑10, applied lightly over the soil under the branches and watered in.

If the plant shows pale leaves, weak growth, or reduced flowering, repeat a similar balanced feeding in midsummer. Avoid high‑nitrogen lawn fertilizers, which push leaves at the expense of flowers. Do not fertilize late in the year, since soft new growth can be damaged as the season cools. Keep fertilizer off the trunk and leaves and apply only to moist soil, then water well so nutrients move down to the roots without burning them.

Prune: Prune Blue Angel™ Althea in late winter or early spring before new leaves appear, when the plant is still resting. At this time, remove any dead, broken, or rubbing branches, cutting back to a healthy point. You can also shorten the previous year’s growth by up to about one third to keep a neat shape and encourage strong new flowering shoots. Make each cut just above a healthy bud, and cut at a slight angle so water runs off the cut surface. Use clean, sharp pruners and disinfect them before you start and if you cut any diseased wood. Avoid hard pruning in late spring or summer, because you will remove many of the developing flower buds. Do not shear Blue Angel™ Althea into a tight ball or box; instead, keep a natural outline with some space for light and air to reach the center.

Pest & Disease: Blue Angel™ Althea most often faces aphids, Japanese beetles, and spider mites, along with leaf spot, root rot, and occasionally powdery mildew. Aphids gather on tender shoots and flower buds, causing curled or sticky leaves and sometimes black sooty mold growing on their sugary residue. Japanese beetles chew holes and lace-like damage between leaf veins, while spider mites cause fine stippling, bronzing, and faint webbing, especially during hot, dry weather. Leaf spot appears as scattered brown to dark spots that may yellow around the edges and lead to early leaf drop. Root rot usually shows up as chronic wilting, yellowing, and poor vigor despite moist soil because waterlogged roots are dying and cannot take up water well. Powdery mildew looks like a white dusty coating on leaves and young growth, often when air circulation is poor. Small aphid populations or light mite damage can often be watched and controlled with a strong spray of water, pruning of heavily infested tips, and support from beneficial insects; insecticidal soap or horticultural oil works well when coverage is thorough, and stronger insecticides are rarely needed. Hand-pick Japanese beetles in the morning or shake them into soapy water; severe feeding can be reduced with labeled foliar insecticides, but treatment is usually only worthwhile when damage is persistent. Remove spotted or mildewed leaves when practical, avoid wetting foliage late in the day, and use labeled fungicides only if disease is spreading and appearance matters. For root rot, improve drainage, reduce irrigation, and avoid rewatering until the upper soil begins to dry. Prevent most problems by planting in well-drained soil, watering deeply but not constantly, avoiding excess nitrogen that drives soft aphid-prone growth, cleaning up fallen leaves, and checking new spring growth and summer foliage regularly so action can be taken early.

Attribution:  This plant information is the copyrighted property of PlantTAGG, Inc. (www.planttagg.com) and is published with permission.

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