Here Comes the Sun: Wetlands in Bloom

Written on: May 26th, 2026 in Education and Outreach, Natural Resources

By Olivia Allread, DNREC’s Wetland Monitoring and Assessment Program

Picture yourself walking through a forested freshwater wetland or a steamy tidal marsh. As you’re trudging through hues of fern, pickle, or chestnut, you see a light pink color in the distance. When getting closer, you see more of this stark color along stems, and boom – you’ve found yourself a series of flowers. With warmer weather on the horizon, wetlands across Delaware will be showcasing displays of more than just green and brown. Let’s explore some of what will be in bloom throughout the First State when the days are longer and sunshine is abundant (hopefully).

Swamp Rose (Rosa palustris), Freshwater or Non-tidal Wetlands

Bloom Time: June to July

Since we mentioned pink already, we will start with that! Swamp rose is a member of the Rosaceae family, or rose family, which includes a large range of roughly 2,000 species of trees, shrubs, and herbs worldwide. In Delaware, this native can thrive in wetland riparian buffer zones and is usually found in non-tidal marshes, swamps, streambanks, and ditches. The deciduous plant grows quite hefty in size, reaching from 3 feet to 6 feet in both width and height. The flowers are light pink with 5 petals and can grow alone or in small clusters, most notably providing contrast against the green hues of the leaves and stems. Although the flowers are beautiful, be careful before getting too close – like many roses, the stems are very prickly.

Fun fact: The word “palustris” comes from the Latin meaning “swampy” or “of marshes”. If you know wetlands well, you probably recognize the word “palustris” from the wetland classification palustrine, classifying wetlands that are non-tidal in inland areas like swamps, bogs, and marshes with low salt concentration.

*Swamp rose in bloom among its bright green leaves.*

Saltmarsh Fleabane (Pluchea odorata), Tidal Wetlands

Bloom Time: July to October

Our crew loves coming across this fragrant flower in the field. Pluchea is a charming plant that provides a soft look in tidal wetlands with bright green leaves and tiny magenta flowers arranged in rounded clusters. The stems and leaves are covered with tiny hairs making them feel slightly fuzzy or velvety to touch. By late summer, this broadleaf herbaceous species is often abundant in saltwater and brackish water marshes, but hard to notice among the dense vegetation that is in full force during this part of the growing season. Not only does this flower provide a pop of color, but creates foraging habitat for many late season pollinators and has a sweet (and some say funky) pungent scent. During our summer field season, we have consistently seen Pluchea in bloom at our Indian River Near Millsboro Beneficial Use Dredging Project – even in wetland areas currently under restoration.

*Saltmarsh fleabane in bloom during a sunny summer day.*

Yellow Flag Iris (Iris pseudacorus), Freshwater or Non-tidal Wetlands

Bloom Time: May to July

Well, we had to throw in a bad guy. Though pretty in color and texture, this species is invasive to both tidal and non-tidal wetlands throughout Delaware. Imported to North America in the early 1700s as an ornamental plant, its propagation as a horticultural species and variety of uses along lakes and ponds expedited its ability to displace native plants. Yellow flag iris is a medium-sized broadleaf herbaceous plant that often forms dense colonies, with the yellowish flowers forming on the end of a roundish stalk. Irises are easily recognized when in bloom because 3 of the petals face upward, while 3 large sepals face downward. How can you avoid this aggressive plant? A great, native alternative for a marshy or wet area is blue flag iris (Iris versicolor). This adaptable species has bright, violet-blue flowers with a butter base that attract helpful pollinators like bees.

*Yellow flag iris in bloom (Photo Credit: Center for Aquatic and Invasive Plants).*

Sea Lavender (Limonium carolinianum), Tidal Wetlands

Bloom Time: July to September

Easy, breezy, beautiful. The tiny flowers of this herbaceous plant can exclusively be seen in tidal wetlands throughout Delaware during some of the hottest summer months. Scattered among the marsh grasses and other broad-leafed tidal plants, this low growing species is harder to notice until it’s right under you. It blooms with blue or pale purple flowers in late summer, adding the coolest splash of color to the saltmarsh. Yet the flowers have no scent at all. Despite its name and papery blooms, it’s not related to true lavender and in fact belongs to the Plumbaginaceae family. As a halophyte, or salt-tolerant plant, it thrives well in tidal wetland conditions and grows right next to quintessential marsh species such as salt meadow hay and smooth cordgrass.

*Sea lavender in bloom during the month of August.*

Smooth Beggartick (Bidens laevis), Freshwater or Non-Tidal Wetlands

Bloom Time: June to October

Speaking of sun, this wonderfully yellow fast-growing perennial blooms early summer all the way through the mid-fall. Spotting these flowers is easy due to their size and abundance on the stem itself; the large blossoms have 7-8 petals, and the plant can have one or more flowers on a single stalk. The yellow florets are centered around a brown disc attached to an upright stem growing up to 6 feet tall – a quintessential flower with symmetry and softness sticking up when in bloom. This species can be found near ponds, streams, and wet open woods, but is also a welcome addition to native plants gardens, rain or bog gardens, and homemade ponds. Since smooth beggartick blooms until there is frost in the colder weather, late season pollinators can utilize the flowers as a great resource for pollen and nectar as temperatures start to drop.

*The bright yellow hues of smooth beggartick in bloom.*

Swamp Milkweed (Asclepias incarnata), Freshwater or Non-tidal Wetlands

Bloom Time: June to August

When you hear milkweed in Delaware, it usually is a good thing. There are a variety of species native to our area, and they all represent a critical link between the importance of native plants and biodiversity. Hello, human survival! One of the best things about swamp milkweed is it is easy to grow and can live in an assortment of conditions. These plants enjoy a sunny spot near tidal freshwater marshes, inland shrubs, forest swamps, ditches, and wet meadows – as long as the soil stays wet. Even more exciting, the flowers have a delightful smell and grow in plentiful clusters of purple, pink, or white. Swamp milkweed is an exceptional wetland plant for any level of landscaper or backyard gardener looking to enhance habitat for vital pollinators or simply create stunning focal point with flowers.

While Monarch caterpillars love swamp milkweed, be careful! It is toxic to humans and livestock, especially sheep. Read up on the importance of milkweed species in Delaware here.

*Swamp milkweed in bloom out in a freshwater wetland.*

Learning about plants, especially wetland species, is not the easiest task. It can be intimidating at times but rewarding when you start to train your eyes to the world around you. Every time our crew is in the field we are gaining knowledge; even the most advanced wetland scientists debate on leaf shape and arrangement. The best way to start learning about the natural world is to see it for yourself and not set expectations. Read when you can, look at resources online, join local nature groups, attend native plant sales – there are so many ways to immerse yourself in the natural world. The few plant species we covered give you an idea of what is out there, so let’s keep it simple for closing out this feature on wetlands in bloom; turn up the volume to a classic.