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Birch -

If you're sneezing during spring, chances are these trees might be part of the problem. Grown throughout the Northern Hemisphere, their pollen is very likely to trigger allergies.

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Birch -

Often planted in yards and other landscaping, their white bark makes them very easy to spot.

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Bermuda grass -

Native to Europe, Africa, Australia, and much of Asia, this type of grass can also be found across the Americas.

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Bermuda grass -

Bermuda grass is a likely a culprit for allergy symptoms, as it's often planted on front lawns.

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Pine -

Pine trees are known for their distinctive cones and fragrant needles, but they also produce a significant amount of pollen.

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Pine -

Symptoms of pine pollen allergies typically include itchy eyes and a runny nose, with or without sneezing and congestion.

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Ragweed -

One of the most common allergy triggers in North America, ragweed grows everywhere across the continent.

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Ragweed -

Its pollen season runs from August to November, but levels are highest around mid-September. It can be worse on hot, dry, windy days.

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Cedar -

There are about 70 different kinds of these trees and bushes, including juniper, cypress, and Lebanese cedar.

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Cedar -

Starting in January, their pollen season is long. Some of these trees and bushes can even make pollen until May or June.

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Nettle -

This type of weed makes pollen for most of the year, though more in late summer and fall.

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Nettle -

They can stick to you and cause an allergic reaction on your skin, too.

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Elm -

Distributed over most of the Northern Hemisphere, this type of tree makes pollen in the fall.

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Elm -

The American elm has been steadily dying out since the outbreak of Dutch elm disease in Ohio in 1930. However, the sturdy Chinese elm has stepped in.

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Bluegrass -

Native to practically all of Europe, North Asia, and the mountains of Algeria and Morocco, this type of grass is also found in the more humid parts of the US.

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Bluegrass -

Also known as Kentucky bluegrass, it can cause serious allergies, especially in the summer months when there's more of it.

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Oak -

Widely distributed in the Northern Hemisphere, many people are allergic to oak pollen and suffer come spring.

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Oak -

Common in residential areas and parks, there can be a ton of pollen floating through the air. That can cause serious reactions in some people.

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Pigweed -

Native to Africa, Southern Europe, Asia, and North America, its flowers make a lot of pollen in late summer and early fall.

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Pigweed -

If you see the flowers and it's a 'male' pigweed, then it produces pollen.

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Poplar -

Native to most of the Northern Hemisphere, these trees make pollen in the spring.

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Poplar -

However, only the 'male' trees make pollen. So if you're allergic to poplar but want to plant one, ask your local nursery for the 'female' version.

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Sagebrush -

Found all over the Northern, Western, and Midwestern states in the US, these plants make large amounts of pollen.

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Sagebrush -

Depending on the type, they can have small yellow or white flowers, which are very likely to cause allergy symptoms.

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Ribwort plantain -

Also known as narrowleaf plantain and English plantain, this weed sheds pollen from May to November.

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Ribwort plantain -

A widespread species that's native to Europe, North Africa, and parts of Asia, it's thought to be a major cause of allergies.

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Lamb's quarters -

This plant looks a lot like pigweed, but it doesn't make nearly as much pollen.

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Lamb's quarters -

However, as it's abundant and widespread, pollen is dispersed by wind, making it difficult to avoid for those with hay fever.

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Walnut -

Spread across North America, Asia, and South America, the walnut tree flowers in late spring.

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Walnut -

Their pollen can be a big trigger for allergies, but it's heavy and usually drops to the ground before it can travel very far.

Sources: (Medical News Today) (WebMD) (Verywell Health) 

See also: How to beat seasonal allergies without medication

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