Smartweed (Persicaria)

Common names:
Give a thumbs up Knotweed
Give a thumbs up Smartweed

General Plant Information (Edit)
Plant Habit: Herb/Forb
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Mesic
Minimum cold hardiness: Zone 3 -40 °C (-40 °F) to -37.2 °C (-35)
Maximum recommended zone: Zone 10b
Plant Height: 6 to 36 inches
Plant Spread: 6 to 36 inches
Leaves: Deciduous
Flowers: Showy
Flower Color: Green
Other: Greenish
Bloom Size: Under 1"
Flower Time: Late winter or early spring
Late spring or early summer
Late summer or early fall
Propagation: Other methods: Division


What's Blooming in OctoberWhat's Blooming in October
October 17, 2011

October usually spells the end of the gardening season here in Iowa. This year we've been blessed with an extended season as there has been no frost yet. Come on in and see what's still blooming at Cottage-in-the-Meadow Gardens! Check out the photo contest at the end of the article and take a moment to scroll down farther to the forum to show us some of the flowers blooming in your garden right now.

(Full article27 comments)
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Photo gallery:

Discussion Threads about this plant
Thread Title Last Reply Replies
I know I know this plant... -- Amaranthus hybridus by starbookworm Oct 11, 2018 9:58 PM 6
What plant is this? Red stalk, tiny white flowers by soybean Oct 3, 2018 11:02 PM 5
What is this--a flower or a weed? by gardenglassgems Sep 10, 2018 6:08 PM 2
This plant name by Droximo Jul 29, 2018 5:59 PM 1
Plant identification by Maisy1 Jul 26, 2018 1:40 PM 3
Identify this plant by Nicxr Jul 16, 2018 7:59 PM 4
What is this flower? by Nicxr Jul 17, 2018 9:20 AM 2
Vine taking over my garden by jazzlover Jun 25, 2018 9:14 AM 11
Unknown plant - help! by Cakeangel Jun 23, 2018 9:32 AM 7
What is this? by Anlia Jun 20, 2018 9:21 AM 4

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