Leaves on tomato plants curl upward because of several reasons, including viral infections, an effort to resist the excessive moisture when the conditions are excessively cool and moist and an effort to conserve water during a dry spell. Learning to identify the signs and knowing the reasons behind the curling up of tomato leaves is the most important aspect for a successful treatment and prevention of this problem.Know More
The virus in a viral infection can be transmitted through infected transplants or through whiteflies. After the infection takes place, it may take about 3 weeks without showing any symptom of the infection, but the most common sign of this infection is the curling up and yellowing of the tomato leaves. This infection retards the growth of the plant, leading to a failure of the development of the flowers.
During excessively cold conditions, tomato leaves normally curl upward and become leathery so as to resist the excessive moisture. The condition is very common during the time of setting fruits, and it is often visible on staked and pruned tomato plants.
On the other side, the dry spell, uneven watering and the high temperatures cause tomato leaves to curl upward so that they can conserve water. However, under these conditions, the leaves do not appear to be leathery.Learn more about Outdoor Plants & Flowers
Tomato plants prefer lots of space, light and water. Use a fan, black plastic and mulching to create stronger, more flavorful plants. Practice prevention of disease by removing the bottom leaves of the tomato plant.Full Answer >
According to The National Gardening Association, in order to care for an Astilbe plant, a gardener must apply compost regularly, water it well during the summer and thin the plants every few years. The Astilbe are thinned or divided by unburying them and separating the clumps.Full Answer >
Curled or rolled leaves on a tomato plant can be a sign of physiological problems, herbicide damage or viral infections, according to the University of Clemson Cooperative Extension. The possible physiological reasons include transplant shock, change in temperature at night, drought, severe pruning and root damage.Full Answer >
Leaves on boxwood shrubs turn yellow and leave the plant looking diseased for many reasons, including damage from the cold weather, root rot and nematodes. English boxwood decline causes the leaves to bronze and then turn orange, yellow and brown before falling off the shrub. leaving only the stems.Full Answer >