Most cactus love cool fall temperatures, but do bring in most other succulents before nights become cold. I love this plant and want to try again. Some, such as the German primrose (P. obconica) and the fairy primrose (P. malacoides), are usually considered annuals and die after flowering. With proper care, Rhododendron simsii in bud stage can give up to six weeks of enjoyment. In the later stages of the disease, the galls become covered with a white powdery substance. Plant azaleas and rhododendrons in a well-drained and well-aerated soil. A summer outdoors in a partially shady spot is practically a sine qua non for this plant anyway. A cool conservatory or glasshouse at 7-13°C (45-55°F) is ideal at this stage. Feeding: Apply a lime-free liquid fertiliser once every two weeks from late spring to early autumn. Look for a spot that is sunny in the spring (these bulbs will be dormant and underground during the summer, so aren’t concerned in the least about summer shade). Avoid plants that lack normal green color, appear wilted in the morning, or have dark, discolored roots. Therefore, bring them in only when frost is announced. As the galls age, they turn brown and hard. Crown rot causes the lower portions of the stem to have a brown discoloration of the wood near the soil line. Florist’s Hydrangea (Hydrangea macrophylla), Florist’s hydrangea: keep it well watered! Cool fall temperatures help indoor azalea (Rhododendron simsii) set buds. The leaves are sometimes glossy, but practically all varieties have some bristly hairs on leaf margins. Tradition has that you give Mom a bouquet of flowers for her day and that’s fine. This fungus survives in the soil, so it is important to replace the ground litter with uncontaminated mulches. See Table 1 for examples of products. When the cutting is well rooted (in about 8-12 weeks), transplant it to an 8cm (3 inch) pot of the potting mixture recommended for mature plants. In cool or cold climates, wait until any danger of frost has passed. La pianta è di piccola taglia ha un arbusto sempreverde, con foglie lanceolate indivise con la pagina inferiore e margine intero verdi scuri. if the plant was in a 6-inch [15 cm] pot, move it to a 10-inch [25 cm] pot). To prolong their effect, buy a pot with many flower buds, but only one or two open flowers, a guarantee of weeks of flowers to come. Re-blooming: Unless the winters are short and mild, Rhododendron simsii plants are difficult to get to rebloom (unlike the hardy garden Rhododendrons/azaleas). In areas where summer rains are infrequent, it’s probably best to either store up winter rainwater for summer use or to water your azalea year round with distilled water. Leave your azalea outdoors well into fall, bringing it indoors only when frost threatens. Before putting it outdoors, transplant it into a pot one size larger. Throughout the year, fungal spots (Cercospora species, Septoria species, Phyllosticta species and Colletotrichum species) of various colors appear on azalea and rhododendron leaves. Prune infected branches well below all discolored wood and dispose of dead plant material. Source: The average potting mix, with a pH of 5.5 to 6.5, is just a touch too alkaline. Firm the soil slightly at the base of the planting hole to prevent the plant from settling into the bed. For azaleas, fungicide sprays containing either thiophanate-methyl or mancozeb can be used. All recommendations are for South Carolina conditions and may not apply to other areas. Mom can grow it indoors while it blooms, then put it outdoors for the summer, in a fairly shady spot. Since being relocated from our shady courtyard to a sunny spot at our front yard garden, our Rhododendron simsii has grown more beautiful than ever. Do not plant azalea and rhododendron plants into sites where plants have previously died from root rot. Growth stops, no new flowers are produced, leaves yellow and fall off … it’s just not a good thing. Most of the others, though, and especially the very popular common primrose (P. vulgaris) and its hybrid, the polyanthus primrose (P.x polyantha), are hardy. As the cool treatment progresses, you’ll see plump flower buds form on the ends of the branches, a sure sign you’re doing everything right. Try giving it a soak—immersing the whole root ball in tepid water for 10 to 30 minutes—once every 3 to 4 days. Li Rhododendron simsii grown indoors are almost invariably hybrids of mixed parentage and are all small shrubs rarely more than 45cm (18 inch) in height and spread and they have 2-3cm (0.8-1 inch) long leathery, generally egg-shaped leaves. Prime members enjoy FREE Delivery and exclusive access to music, movies, TV shows, original audio series, and Kindle books. Funnel-shaped flowers are borne at the ends of the stems. Botanical name Rhododendron simsii Group Evergreen Flowering time Winter Height and spread 45-60cm (18in-2ft) Aspect Light, dappled shade Hardiness Frost tender Difficulty Difficult In most countries, including Canada, the United States, and most of Europe, it’s the second Sunday of May, but in Spain, it’s the first Sunday in May and in France, the last Sunday of May. Their flowers are often lasting several weeks. Rhododendron indicum Botryosphaeria rot and canker (Botryosphaeria spp. simsii(Planch.) Heavier clay soils should be amended with organic matter before planting. At 25 ºF, the leaves will be curled very tight and begin to droop. This disease is favored in poorly drained areas or when plants are set too deeply. Uses: This beautiful flowering shrub is able to combat formaldehyde from sources such as plywood or foam insulation. Source: Dieback is an important disease of hybrid rhododendrons in the landscape and is caused by the fungus Botryosphaeria dothidea. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. Indoors, keep the air humidity up or the flower buds could dry up. Yellow leaves is an indication of either an iron deficiency or the presence of lime in the potting medium or water. However, it will actually live for decades indoors and rebloom annually if you know what to do. Move the plants gradually from cool into warmer positions if absolutely necessary, but flower will last longer if they are kept cool. Rhododendron is a member of the Ericaceae (heath plant) family. Flowers range from white to dark red. Apply all chemicals according to directions on the label. Specific Bonsai care guidelines for the Azalea Bonsai. Rhododendron indicum var. There are many kinds of primroses, many of which are sold as gift plants. Water the plant with soft water. Plant a 5-8cm (2-3 inch) long cutting in an 8cm (3 inch) pot of moistened rooting mixture consisting of two parts of coarse sand or perlite and one part of peat moss. Rhododendron breynii In the United Kingdom, Mothering Day is the 4th Sunday of Lent, so it moves around quite a bit. It is useful if the plants can be taken outdoors for a few months each year on a well lit verandah or balcony. ).Leaving these plants outdoors for a few extra weeks even tends to encourage better flowering when they do come back indoors. For rhododendrons apply a product containing a copper-based fungicide or chlorothalonil. Azalea simsii(Planch.) Many diseases and other problems can be prevented by following the recommended cultural practices for proper planting and care. On colored flowers the spots are white, and on white flowers the spots are brown. Top subscription boxes – right to your door, © 1996-2020,, Inc. or its affiliates. Houseplant care: These hybrid forms are usually grown indoors for a single season as temporary winter and early spring flowering plants, but it is possible to keep them alive and attractive for several years under the right conditions. Fertilizing this plant is also tricky, for the same reason: most fertilizers are rich in calcium. simsii They like acid soil and soft water. ... R. simsii … of Plant and Environmental Sciences, Clemson University, Joey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. In April and May leaves and buds of infected plants develop distorted growth. Since soil is a natural water reservoir, more soil around its roots means the plant can now go longer between waterings. Funnel-shaped flowers are borne at the ends of the stems. There you go: you really can make your indoor azalea thrive and even rebloom indoors. and lily of the Nile (Agapanthus spp.). Prevention & Treatment: Remove fallen leaves. What can I do to keep it alive? ), Daffodils and hyacinths make a great combo. formosanumHayata In this category you’ll find such plants as indoor azalea (Rhododendron simsii), some orchids (including Cymbidium), Christmas cactus (Schlumbergera spp. Prevention & Treatment: The most important things that you can do to control this disease in the home landscape are to pick and destroy infected flowers and avoid overhead watering. It is a shrub that grows to 2 m in height, with leaves that are ovate, elliptic-ovate or obovate to oblanceolate, 1.5–5 by 0.5–3 cm in size. Watering: To make sure that indoor grown Rhododendron simsii are permanently moist at the roots (they are almost always potted in pure peat moss) water them plentifully, giving enough at each watering to keep the potting mixture thoroughly moist. Apply these fungicides according to directions on the label.