Big pollen producer, chrysanthemums help stretch the allergy season from spring, throughout summer and well into autumn too.

IN PICTURES: six plants hayfever sufferers should avoid

Chrysanthemums, sunflowers and oak trees have been named as some of the worst plants that trigger hay fever allergies.

A team of outdoors experts from BillyOh.com have revealed six plants that produce huge numbers of airborne pollen grains which play havoc with allergies over the warmer months.

Its not just plants with big showy flowers that cause allergies to flare up. Plants that rely on airborne pollination, like oak trees, have small grains of pollen that will aggravate allergies too.

5. Oak trees

Its not just plants with big showy flowers that cause allergies to flare up. Plants that rely on airborne pollination, like oak trees, have small grains of pollen that will aggravate allergies too.
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