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SEASIDE ALDER ANYONE?

7 years ago

Do you know about Seaside Alder? It is AKA Alnus maritima. It is restricted to a few locations on the Delmarva Peninsula as well as a couple tiny, disjunct populations further west. I first saw it on Hudson Pond in Delaware, below is a plant grown from seed from that population. Like other alders this shrub forms a multi-stemmed habit.

See the large cones, these are from last year's flowers.

Male catkins - unlike other new world alders, this one blooms in late summer.

Consider seaside alder or any American alders for that matter. They tolerate but do not require wet soils.

When making landscaping choices for vacation homes the "go to" plants for the Atlantic seaboard are Japanese Black Pine, rugosa rose, Miscanthus and tamarix. To me, these plants alter the character that makes the location special in the first place. As an alternative why not try one of the alders, wax myrtle or bayberry, panic grass, maybe even prickly pear. The alder flycatcher favors populations of alder, the more the better.

Give us some suggestions of other natives you would like to see included in riparian plantings.

Comments (13)

  • 7 years ago

    Willows native to that place, like East Coast Willow (Salix caroliniana).

  • 7 years ago

    Thanks for posting, Sam -- I assume that's you above? Always interesting to hear about relatively rare, native trees that are unknown/overlooked.

  • 7 years ago

    Thanks for posting. Maybe Baccharis halimifolia. You're talking about salt water coastal plants? Beach plum and scrub oak would be nice to see intentionally planted.

  • 7 years ago

    Good suggestions, in the case of Baccharis we sure have an abundance of riches in the I-95 corridor.

    Pictured here is Pinxterbloom, one of many native azaleas.

    Below is clethra or pepperbush commonly found in swamps and wet thickets.



  • 7 years ago

    We have a good amount of Clethra around here, in the same areas with button bush, silky dogwood, and willow. I always get a little excited to see Spirea tomentosa and alba. The heath family is interesting, I've been looking out for Eubortris racemosa, Kalmia angustifolia and Lyonia ligustrina on my hikes. Blue vervain Verbena hastata has a nice effect in mass plantings in moist areas, and Lobelia cardinalis, perpetually surrounded by pollinators, will stop you in your tracks. There are so many functional sedges and grasses too. It makes me wonder who popularized planting miscanthus everywhere and why.

  • PRO
    7 years ago

    Persea palustris is a particular favorite of mine.

  • 6 years ago

    Once again it is blooming season for the seaside alder. Earlier on this thread I showed last year's cones of the alder. Do you agree that this is an example of a coniferous shrub?

  • 6 years ago
    last modified: 6 years ago

    They're in the order fagales with oaks, birch, and beech, right. Conifers would be in Pinales, so if by coniferous you're trying to say its a conifer, that would be inaccurate. Man now I'm going to have to look at the structure of a birch/alder fruit vs. a true conifer cone.

  • 6 years ago

    Here we go into that semantics thing again! 'Coniferous' is typically a term applied to gymnosperms. Alders are angiosperms so even though they do produce a cone-like strobilus, they are not technically coniferous.

    Other flowering plants that produce strobili include hops, magnolias and cannabis.

    Most botanists prefer the use of 'cone' be applied only to gymnosperms.

  • 6 years ago

    Skip1909, thanks for that great response.

  • 6 years ago

    It'd be a false-conifer. :) :)

  • PRO
    last year
    last modified: last year

    Seaside alder (Alnus maritima) is a fantastic native choice! 🌿 Its late-summer blooms and tolerance for wet soils make it a great alternative to non-native landscaping plants.Wax myrtle, bayberry, and panic grass are excellent picks too! I'd also suggest buttonbush, swamp milkweed, and river birch for riparian plantings. 🌾🐦

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