Most flowers with large petals are insect-pollinated, but it is important to remember not to smell these plants as wind pollen can be deposited on the petals of any flower. Avoid heavily scented flowers which may occasionally trigger attacks in people with asthma, in view of their irritant effects. Most herbs are insect-pollinated so that many are acceptable. If herbs are to be dried however, it is best done outdoors. This is the Daisy family which includes Chrysanthemums, Michelmas Daisies and Dahlias.
Shrubs are insect-pollinated and are also easy to maintain.
Avoid climbing plants around bedroom windows as pollens and dust can collect on the leaves and blow into rooms when there is a breeze. Many of our common trees are wind-pollinated, so it is best to avoid Ash, Birch, Elder, Hazel, Horse Chesnut, Oak, Plane, Sycamore, Willow and Yew. All these trees produce masses of pollen during the early summer and can cause problems. Most of the plants associated with pools are not likely to cause allergic reactions. Arum Lily, however, is an exception and may trigger symptoms.