Glade Mallow (Napaea dioica)

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Partial or Dappled Shade
Water Preferences: Wet Mesic
Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 8b
Plant Height: 4 to 10 feet
Plant Spread: colony spreads
Flowers: Showy
Fragrant
Flower Color: White
Bloom Size: Under 1"
Flower Time: Summer
Underground structures: Rhizome
Taproot
Suitable Locations: Bog gardening
Uses: Will Naturalize
Wildlife Attractant: Bees
Butterflies
Resistances: Humidity tolerant
Propagation: Seeds: Stratify seeds: moist a few months
Suitable for wintersowing
Propagation: Other methods: Division
Stolons and runners
Pollinators: Moths and Butterflies
Bees
Miscellaneous: Dioecious

male flowers with white stamens

Photo gallery:
Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2019-07-14male flowers with white stamens
By ILPARW
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Location: My Northeastern Indiana Gardens - Zone 5bDate: 2011-10-22New leaf.
By chelle
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Location: My Northeastern Indiana Gardens - Zone 5bDate: 2010-07-08Leaf Attachment
By chelle
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Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2019-07-14a patch in bloom
By ILPARW
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Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2019-07-14female flowers with compound pistils
By ILPARW
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Location: Northeastern Indiana - Zone 5bDate: 2010-07-08Inside greenhouse.
By chelle
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Location: My Northeastern Indiana Gardens - Zone 5bDate: 2012-07-09
By chelle
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Courtesy Crownsville Nursery
By vic
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Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2019-07-14summer foliage
By ILPARW
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Location: Jenkins Arboretum in Berwyn, PennsylvaniaDate: 2017-07-30plant near pond
By ILPARW
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Comments:
Posted by chelle (N.E. Indiana - Zone 5b) on Oct 30, 2011 8:44 AM

I acquired this plant from a nursery a few years ago. I had originally intended to use it as an "interest" plant in my moist woodland garden; showcasing the very large leaves. At the time I wasn't aware that it is a host plant to the Vanessa cardui (Painted Lady) butterfly. This plant's leaves are decimated entirely by these winged beauties for most of the summer if the plant is placed out in the garden. This non-stop feeding frenzy skeletonizes the leaves , but doesn't appear to harm the growth, blooming capacity or longevity of the plant.The second year I had it I planted it in the dirt floor of my unheated greenhouse with much better results. I now have enough of the original plant that I have some in the GH, and some in an out-of-the-way spot in the gardens as a food source for the Painted Lady cats.

This plant is one tough Hombre! The summer temps inside the GH are very hot (surpassing 120 degrees Fahrenheit), the (established) plant gets no additional water from me, and still it manages to survive. It appears to be on some of the endangered species lists for our area. I'm not sure why, unless it's due to the draining of swamplands and moist meadow-lands for other purposes.

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Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Oct 6, 2019 4:12 PM

This is an uncommon species found in sporadic locations in the Midwest of the USA from Ohio to Illinois to Minnesota in moist to draining wet locations. I've only seen it planted at Jenkins Arboretum in southeast Pennsylvania near their big pond, a proper place for it. I did not know what it was for some years as it was not labeled. I considered that it might be the similar Virginia Mallow or Fanpetals (Sida hermaphrodita), some of which were being sold at the arboretum in pots, but it was not. A Facebook friend on the Pennsylvania Native Plant Society page pointed me in the right direction. It is a really large perennial that needs room to spread by its rhizomatous root system that also includes a hollow taproot. The 3 to 9 lobed palmate leaves get to 18 inches by 18 inches. The male (staminate) plants bear the small white flowers about 3/4 " wide with 5 petals and a number of white stamens while the female (pistillate) plants bear 3/4", white flowers with 5 petals with a longer flower tube that is a compound pistil having pinkish stigmata. A few native plant or specialty plant nurseries sell some.

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Discussion Threads about this plant
Thread Title Last Reply Replies
My wintersowing adventures 2010 by gemini_sage Apr 9, 2014 5:08 PM 55

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