If it's fall time, it's okay. If the leaf should be green and it's not, more than likely it is iron chlorosis. Other possibilities are spider mites, over-watering, or diseases. Walk through our online diagnostic clinic.

Azaleas are acid lovers. Certain minerals, including iron, are more available at lower pH values. Yellow leaves on azaleas can indicate an iron deficiency because (1) not enough iron is present in the soil for the azaleas to utilize, or, more commonly, (2) the pH is too high to release the iron that is present. Azalea fertilizer is usually a sufficient acidifier to keep the soil within the proper pH range for maximum nutrient availability.

Leaves turning yellow and dropping off is how a plant responds to stress. The stress can be caused by being too wet, too dry, too hot, etc. If you contact one of our plant specialists, we can discuss your situation with you and determine what might be happening. Ficus plants will frequently react to the stress of being moved from one location to another and will drop leaves for the initial 2-4 weeks as they become acclimated to their new environment.

The answer to this question depends upon which leaves are involved. Yellowing of old leaves on backbulbs is a normal part of the aging process. Therefore, this should not be of concern. However, yellowing of newer leaves is a sign of trouble. Orchids with yellow leaves are an indication that the plant is suffering from either too much light or insufficient feeding. Increase the shading and apply orchid nutrients as directed.

It is perfectly normal for rhododendrons to drop the oldest leaves each year in late summer or earlier during drought conditions . These answers were largely provided by Ed Reiley, the past President of the American Rhododendron Society and a charter member of the Mason-Dixon Chapter.

Fig rust is a very common disease on figs. The rusty foliage that drops should always be raked up and disposed of since the spores on the fallen leaves can infect new unaffected leaves on the tree. There are no EPA approved fungicides for figs grown in Florida. Avocado trees are quite variable as to hardiness and the time it takes to produce fruit. Most fruit within 5 to 7 years if they are not affected by a freeze. You have to hope for a series of warm winters to see your first fruit.

Many nectarine trees are running out of fertilizer, which is evident by yellowing leaves that gradually drop. Some are also affected by a leaf spot fungus that hastens the loss. It is best if the trees keep their foliage another month to prevent early flowering during late fall and early winter. Help the nectarines and peaches hold their leaves a little longer by feeding lightly. If leaf spotting is severe,a fungicide labeled for deciduous fruit tree use could be applied.

Nashville tap water contains approximately 1 ppm phosphate. Available iron will chemically combine with this phosphate forming a compound which is insoluble by the plants. An iron deficiency condition known as iron chlorosis may result in these plants. The plants turn yellow and the leaves and stems both become very brittle. Fertilizers containing iron supplements will correct this condition.

If leaves turn yellow slowly, there may be too much lime in your water. Try to reduce watering, check soil pH and unlock the lime with Eartheart 18-16-9. This plant may need a transplant into fresh, high quality potting soil. Try charcoal in the potting soil and even a drink of "lukewarm" hot tea to adjust the pH.

If the yellow leaves are splotchy, look out. It could be that tiny spider mites have found a home and they can destroy the plant. You'll need to spray with miticides several times. Otherwise, leaves can become yellow due to almost any kind of "stress", e.g., too much or too little water. If the veins of yellow leaves are green, it can be caused by iron deficiency, and wider veins signal a magnesium deficiency (then try Epsom salts).

Yellow leaves can be a symptom of overwatering or a mineral deficiency. Clematis need regular watering but is it is important not to let them become waterlogged. Clematis are heavy feeders. The ACS endorses Gro-Power Fertilizer because it is an organic soil conditioner as well as a fertilizer and it contains the necessary minerals to keep clematis healthy.

Bigleaf hydrangea is susceptible to iron chlorosis. Because, iron becomes less available as pH increases, iron chlorosis is most likely to be found on plants growing on high pH soil. In contrast to nitrogen deficiency, which is expressed as yellowing of old leaves, iron chlorosis is found on new leaves (see image at right). Iron chlorosis can be corrected by the addition to iron to the soil. The best way to do this is to use a chelated iron product.

Brown edges are often a sign of salt damage; the salt contents in our tap water can cause the damage and is often compound by insufficient water. Thoroughly water the plant (shrubs to 2 feet deep; trees to 3 feet deep to leach excess salts away from the roots.

They are probably not getting enough water. Set a mister near the terrariums and allow students to mist the terrarium once or twice a day. Students should not water so much that they make the soil muddy. A water cycle can form inside the terrarium in which case the terrarium "waters itself". Check them to see if this is happening as it doesn't always do so.

Sooty Mold - Appears as a black, sooty growth on the upper side of leaves. Is harmless, but indicates that an insect was or is present (usually aphids, whiteflies or scales). Whiteflies. As these piercing-sucking insects feed on the undersides of the leaves, they secrete a sticky, clear fluid that drops onto the leaves below. Sooty mold grows upon this secretion. Sooty Mold Water or Varietal Problem. The problem of splitting fruits usually occurs in the early fall.

Chewing insect - Usually either a grasshopper or caterpillar. Damage is usually contained to a small proportion of leaves and should be ignored. The caterpillar is called an Orange Dog, and is the larval stage of the beautiful Giant Swallowtail butterfly.

The USDA Forest Service does not provide this service, but many state forestry departments do. Contact your state forestry department to see if they provide this service. You can find your state forestry department online at http://www.stateforesters.org/SFlinks.html. For the Colorado State Forest Service, you can click on: http://www.colostate.edu/Depts/CSFS/.

If you're not sure who owns a tree near a right of way, we recommend that you call your town or city hall and ask for the Tree Warden. Every town and city in Connecticut has a Tree Warden, whose job it is to protect the trees on public property and to protect the residents and their property from those trees, should they become a hazard.

This is normal throughout the year, however it is most noticeable during the Spring time. All leaves will be replaced over the course of one year, so naturally you will see a lot of yellow and brown foliage as the new leaves form. Temperate bamboo are evergreen and if all is well with the planting, it should never be completely barren. The tips of the leaves are often brown and this can be caused by many factors. In most cases it is wind damage, but it can also be caused from improper watering.

This usually indicates a watering problem, either too dry or too wet. Or it could be lack of nutrients. Letting a wave petunia wilt will cause the leaves to turn yellow. If it has been wilting for some time, it could cause the leaves to die. If this happens, the best things to do are prune back the plant and watch the soil to give it the correct amount of water. Feed it in a day or two. Many times the plant will re-grow and come out of it fine.