The black locust tree (Robinia pseudoacacia) is a deciduous tree that can grow to eighty feet in height. The thorns on a lemon tree are developed at the nodes. Check the nursery tag for the name of the cultivar. The sharp thorns on these plants can cut and poke holes in your skin, and the small wounds provide an entry point for pathogenic organisms. Key Lime. That's bad. Like it or not, some of the same lime trees that entice us with their fragrant leaves or tangy-sweet fruit also threaten us with their nasty, skin-piercing thorns. Expert gardener’s tip: For thorn-free harvesting, just wait for the Key limes to turn yellow and fall to the ground, When collected at this, they’re completely ripe, so use or juice them right away. Is It OK to Mix Satsuma Orange & Lemon Trees Together? ; Plant thorn arthritis typically affects only a single joint -- the joint that was pierced by the plant thorn. They fuse a single vegetative lime tree bud, or scion, onto the roots, or stock, of another tree. Thorns on a lemon tree (Citrus limon) are not cause for alarm, but they may indicate some pruning is required. The thorns of lime trees can cause skin irritations such as rashes and blisters and a condition called phytophotodermatitis. Why Lime Trees Have Thorns. © Copyright 2020 Hearst Communications, Inc. These slim, green branches will have numerous thorns and must be removed as soon as possible. ; Plant thorn arthritis causes the involved joint to be swollen, slightly reddish, stiff, and painful. No, its not an anomaly; there are thorns on citrus trees. To prevent this disease, prune and fertilize in the spring and summer to reduce the amount of fall growth. The trees are taller than the Mexican lime, reaching up to 20 feet. Nearly all citrus have thorns as young seedlings; most varieties quit making them as the tree matures. Lime trees developed thorns as a way to discourage hungry animals from nibbling on their tender young leaves: In the case of Kaffir limes, strong spines up to 1 ½ inches long protrude from the branches just beneath each cluster of lemon-scented leaves. The risk of infection is high. It’s simple. My hand has been swollen and sore for two days now. Budded lime trees are most likely to grow thorns while still young. Trifoliate orange suckers will eventually form a very thorny thicket. Thorny suckers often grow from the bases of budded limes. A scratch from a black locust may … And those wounds can allow infections from pathogens in … But they’re also much more numerous, and — at only 3/8-inches long — much harder to spot. Because their leaves are delicate enough to tempt hungry wildlife. Citrus are usually grafted onto a rootstock of a different variety to take advantage of the rootstock's positive characteristics. Determining if your lemon is a variety that is prone to thorns is the first step in planning to deal with the thorns.
How to Pick Them? Canopy sprouts, especially on lemon trees, grow above the graft union, usually growing at a 90-degree angle to the main canopy branches. Fact: Some of the citrus trees with thorns are oranges, mandarins, grapefruits, pomelos, limes and tangelos. It is only mildly toxic unless eaten. Plant thorn arthritis is a noninfectious inflammation of a joint as a result of a thorn puncturing the joint and leaving residual plant matter lodged within the joint. Thorns on plants or thorn-like seeds can cause nasty puncture wounds for gardeners. The same tree will have no thorns on part of it and 1/2-inch thorns on other branches. It boasts abundant, 1- to 2-inch thorns. Here is an article that describes the condition Nothing is more likely to steer hungry animals away from a lemon tree’s succulent leaves and fruit than a mouthful of thorns. This bacteria result in black spots on the fruit called bacterial blast, which is caused by pseudomonas syringae. The thorns on a lemon tree are developed at the nodes. When harvesting thorny Key or Kaffir limes, wearing a pair of heavy-duty, forearm-length leather gloves is essential. Deep thorn wounds in the foot, or even hands if there is contact with soil, greatly increase the risk of tetanus. In most instances the thorns disappear as the trees mature. A lack of certain kinds of nutrients can result in a lime tree not producing blossoms and fruit. Punctures often don't bleed much and may close up quickly, which is one reason they can be dangerous.

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