Both pine nuts and pine trees are common allergens. About 20 years ago horticulturist and author Thomas Ogren became interested in allergy-free gardening because his wife suffered from allergies and asthma.   Christmas Tree Allergies . Jasmine The worst plants for allergies and hay fever in Australia Credit: Supplied If you're planning to plant new trees in your garden this summer, try to stay clear of oak trees to avoid provoking allergies. Oak trees. Pollen from birch trees affects about 25% of allergic rhinitis patients and is usually between April and May. He discovered that many 'dioecious male' trees triggered severe allergies. When studying the case of a man who was having mysterious allergy symptoms, researchers found out he was allergic to birch – … Warren V. Filley, MD, a spokesperson for the American Academy of Allergy, Asthma, and Immunology, gave us the lowdown on some of the most common allergy-causing plants and trees, and how to spot them. Tree pollen is one of the most widespread causes of hayfever, and it is estimated that there are approximately about 100 different types of trees that can trigger allergic reactions. Pollen production from certain trees can make life pretty miserable for sensitive individuals during the spring flowering season. He began research and went back to college to get his MS degree, focusing on plant/allergy connections. 7. Ideal climate: coastal regions. The worst plants for allergies and hay fever in Australia Credit: Supplied. The species causes allergies. 7. Bonsai trees . The tree has roots with water-seeking tendencies that threaten water mains or septic tanks. The good news, from an allergy sufferer’s point of view, is that many of these trees were wiped out by Dutch elm disease, though unfortunately the tree is starting to make a comeback. 6. Real trees can harbor mold, dust, and pollen, and some people have contact skin allergies to terpene, which is found in the sap of trees. The season can last for around four weeks and pollen counts from this variety of tree will be highest on warm,w dry days with a mild wind ... Allergy UK . Plants and trees release their pollen at different times of the year, causing reactions in people with allergies to specific varieties. Pine pollen is produced in spring and can trigger the same people who are allergic to grass pollen. But the American College of Allergy, Asthma, and Immunology (ACAAI) cautions that artificial trees also can be an allergy trigger since they too harbor dust and mold. Tree pollen levels are expected to hit hard this week for all of the UK except Scotland and the far north of England, with the worst to come after Easter. Oak trees send pollen into the air during spring, often causing severe allergies to those allergic to pollen and with hay fever. Grass pollen Australia Credit: Supplied the tree has roots with water-seeking tendencies that threaten water or... 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