Gardening Questions And Answers
Ivy geraniums grow year-round in U.S. Department of Agriculture plant hardiness zones 9 through 10. In cooler climates, many gardeners grow the colorful blooming plants as annuals. However, with careful attention, you can overwinter an ivy geranium and move it outdoors when warm weather returns in spring.
Holes in geranium or pelargonium leaves This is usually caused by caterpillars. There is a moth that can appear about August or September that will chew the leaves of the zonals which needs catching in the evenings or eradicating with a systemic insecticide. Geraniums are rarely affected by slugs and snails.
Watering ivy leaf geranium must be consistent. Moderate soil moisture levels, not too much and not too little, is necessary to prevent edema, which causes ruptured plant cells, manifesting in corky blemishes on the underside of leaves. This weakens the plant, making it susceptible to pests and other diseases.
One of the most common causes of yellowing leaves is too much moisture or overwatering. Cold snaps in the spring or extended cool weather, especially cool, wet weather, can cause geraniums with yellow leaves. In addition, when the geranium leaves become more yellow than green, a nutrient deficiency could be the cause.
Plant Size Its blooms last from early spring until late fall, providing a show of flowers. Deadhead the depleted blooms in order to increase the number of future blooms and pinch off some new stems to prompt branching and shape the growth of the plant. Using trellises can encourage Ivy Geranium to climb.
Zonal geraniums, which are tender perennials, usually are grown as annuals and prefer moist soil. However, their preferred growing conditions make geraniums vulnerable to fungal infections. One of the most common fungi that attack geranium plants is botrytis blight, which is caused by the fungus Botrytis cinerea.
Petals may display whiskers in a contrasting hue or have a ruffled appearance. Ivy geranium plants flower continuously all season long. Traditionally, ivy geraniums bloom strongest when nights are cool, in the 50- to 60-degree range. Newer hybrids, however, have been developed to bloom during heat-filled summer nights.
Pick off geranium budworm caterpillars, also called tobacco budworms, when you see them crawling on your geranium. Geranium budworms usually eat around dusk, and signs of an infestation include small holes in leaves, buds and flowers. The caterpillars are usually brown in color with some green on the sides.
Indoors. Ivy geraniums are attractive indoor plants but they require plenty of bright light and cool room temperatures between 50 and 60 degrees Fahrenheit. To bring a plant indoors for the winter, dig the plant just before the first frost. Don’t overwater, as geraniums are thick-stemmed plants that rot in soggy soil.
Overwatering can cause stem and root rot in any kind of plant, including geraniums. Geraniums can sometimes be saved from rot, which presents with black, wilted stems and roots. Check your geraniums regularly and if you see brown leaves, it could be an indication of stem rot or another fungal problem.