Mentha spicata (Spearmint)
Also known as: | |
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Genus: | Mentha |
Family: | Lamiaceae (Mint) |
Life cycle: | perennial |
Origin: | Eurasia |
Status: |
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Habitat: | part shade, sun; average to wet, disturbed soil; stream banks, shores, ditches, fields, roadsides, gardens |
Bloom season: | July - September |
Plant height: | 1 to 3 feet |
Wetland Indicator Status: | GP: FACW MW: FACW NCNE: FACW |
MN county distribution (click map to enlarge): | |
National distribution (click map to enlarge): |
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Detailed Information
Flower:
Spike cluster up to 5 inches long at the top of the stem and at the tips of lateral branches, often with a pair of smaller spikes arising from the uppermost leaf axils. There is sometimes a distinct gap between whorls of flowers (an interrupted spike), especially on the lower part of the spike. Flowers are about 1/8 inch long, tubular with 4 lobes, pink to lavender or sometimes white; 4 long stamens extend out of the tube. The calyx holding the flower has 5 teeth, is often glandular, and is hairless except for a short fringe of stiff hairs on the teeth.
Leaves and stems:
Leaves are opposite, up to 3 inches long, to 1+ inch wide, narrowly egg-shaped to elliptic, rounded at the base, mostly pointed at the tip, toothed around the edges, hairless or with a few hairs on major veins on the underside, and stalkless or on very short stalks (to 3mm, 1/8 inch). Crushed foliage has a distinct spearmint scent.
Stems are 4-sided, hairless, light green to red tinged, usually branched. Colonies are formed from stout, whitish underground stems (rhizomes).
Fruit:
The persistent calyx holds 4 tiny, oval, dark brown seeds.
Notes:
Spearmint is the plant famous for flavoring teas, candies and other foods, and has also been used as a medicinal, treating ailments from headaches to flatulence. While the plant may resemble other members of the Lamiaceae (Mint) family, the scent of crushed spearmint leaves is pretty distinctive and should readily identify it, though it is further distinguished by the essentially hairless leaves and stems, leaves that are stalkless or nearly so, and terminal spikes rather than whorls in leaf axils as the related, native Wild Mint (Mentha arvensis) has.
Spearmint has only been recorded in Minnesota a few times, but is more common in other parts of the US. While it hasn't been described as invasive, it certainly has the potential to be problematic. The rhizomes can spread rather quickly, form tangled masses a few inches below the surface and result in a dense monoculture. We grew it in the garden to get photos and it started overtaking the area in just a couple seasons. I dug most of it up but likely missed some rhizomes; we'll have to see how much returns.
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More photos
- Spearmint plant
- Spearmint plants in spring
- a colony of Spearmint in summer
- rhizomes can become tangled masses
- leaves are stalkless to very short-stalked; may have a few hairs on veins
Photos by K. Chayka and Peter M. Dziuk taken in the home garden.
Comments
Have you seen this plant in Minnesota, or have any other comments about it?
on: 2021-02-16 09:56:53
In the early 1970s....Because I grew up in Two Harbors, going to Gooseberry was a common activity. My uncle pointed out a patch of spearmint, growing low along a trail. The trail was on the north (or west) side of the Upper Falls, not too far past the Highway Bridge and beyond the stone building on that top side. It was a shady area with pine trees and not a lot of ground vegetation. We picked and chewed a few leaves. As a kid, I was amazed that a leaf tasted just like Wrigley?s spearmint gum!
on: 2023-08-30 15:48:07
I think I might've found a Hybrid between Spearmint (Mentha spicata) and the Native Wild Mint (Mentha arvensis). The hybrid doesn't seem to be spreading like crazy, Pollinators love them, and it Taste good. Would you Recommended Spreading it's seeds everywhere I hike so Hikers can enjoy mint time to time? It's 50% Native, therefore 50% not a problem right?
on: 2023-08-30 19:36:54
John, it is unwise to spread seeds if you aren't sure what species it is. It would be unwise to spread spearmint in any case, hybrid or not.
on: 2023-08-31 21:49:28
What about the Native Version? There's no such thing as an Invasive Native right? If so is that the solution? Using Native Wild Mint to Out Compete our Invasive Species? Seeds are cheap, herbicides are not.
on: 2023-09-01 08:21:35
John, native plants are not considered invasive, though some can be aggressive in cultivation. In my own yard, natives are some of my worst weeds since the natural factors that keep their populations in check are absent in my unnatural suburban yard.
on: 2023-09-03 19:50:13
That begs the Question, Are our forests also becoming unnatural just like your Suburban Yard? Could a Native Plant disrupt the natural balance too? At that point is anything natural left? My local forest gets run off from herbicides & fertilizers thus disrupting the natural balance. Are Invasive species pioneering a new balance? or adapting to an already destroyed balance via Humans?
on: 2023-09-04 09:44:27
John, our forests become unnatural only when people who could prevent it, don't. A new "balance" based on invasive species only decreases biodiversity and increases local extinctions.
on: 2023-09-06 13:52:48
Local Extinctions makes me think about Ghost Introgression. How many extinct species have their genetics in modern plants? Are they Truly extinct or just evolved into a new species? Also How many times have these "Invasvies Species" Cycles happened throughout evolutionary history? How was Biodiversity affected? and How did Nature Overcome the Lack of Bio-Diversity? Will Nature eventually overcome our mistakes (Faster if we Team up with Nature)? Could Native species like deer help further exacerbate Invasives species spread? Despite being a Native Species, did the introduction of Invasive Plants turn Deer into an Invasive Species too? Or is that not Possible? Is the solution to hunt/eat more deer? Or something else?
on: 2023-09-07 08:19:25
John, white-tailed deer population exploded due to habitat fragmentation caused by humans. They thrive in forest and woodland "edge" systems, the amount of which increased dramatically as trees were cleared for agriculture and development. The deer overpopulation causes further habitat destruction.
on: 2023-09-11 02:09:23
They also thrive in Suburban Gardens 🙄 Interesting you bring up Forest/Woodland Edges. They are the most richest ecosystems I've seen. That explains the deer because the edges is usually where I find the most abundant wild edibles. I've cleared/Thinned lots of Trees in my Property to create more Woodland Edge, and noticed Lots of Native Plants popping up. Apparently they were just waiting for the moment to shine. How many of our Invasive Plants do deer eat? Are there any native plants deer actually help out?
on: 2023-09-11 12:54:17
John, I am not aware of any native plants that benefit from deer overpopulation.