Persicaria capitata
naturalizedPolygonaceae

Persicaria capitata

pink knotweed

Naturalized (non-native)non-native

Introduced and now reproducing on its own in the wild.

Persicaria capitata, the pink-headed persicaria, pinkhead smartweed, pink knotweed, Japanese knotweed, or pink bubble persicaria, is an Asian species of plants in the Persicaria genus within the buckwheat family. It is native to Asia (China, Indian Subcontinent, Indochina) and grown as an ornamental in other countries. It has become naturalized in Australia, South Africa and a few scattered locations in the United States.

Read more on Wikipedia →
summary via Wikipedia · CC BY-SA
Seasonality
68 flowering · 2 fruiting annotations · iNaturalist · fetched Jul 2026
JFMAMJJASONDpeak
flowering (peak September) fruiting (peak April)

This is an inference, not a schedule. The curve reflects when observers annotated flowering and fruiting — which tracks observer effort as well as plant behavior, and pools all elevations and islands into one signal. Hawaiʻi’s microclimates vary enormously; a species may fruit in January at sea level and June at elevation. Use this to know when to look, then look.

Gallery · 6 · iNaturalist
open-licensed photos · click any to view its source
Where documented · 31 ahupuaʻa
documented occurrences · iNaturalist + GBIF · iNaturalist 199 · GBIF 300 records
Keauhou · HawaiʻiiNat 65 · GBIF 117
Waiākea · HawaiʻiiNat 51 · GBIF 79
Kaloko · HawaiʻiiNat 10 · GBIF 13
ʻŌlaʻa · HawaiʻiiNat 8 · GBIF 12
Humuʻula · HawaiʻiiNat 10 · GBIF 9
Honuaʻula · HawaiʻiiNat 7 · GBIF 11
ʻĀpua · HawaiʻiiNat 9 · GBIF 7
Piʻihonua · HawaiʻiiNat 4 · GBIF 11
Keaʻau · HawaiʻiiNat 8 · GBIF 6
Kalialinui · MauiiNat 5 · GBIF 5
Kapāpala · HawaiʻiiNat 2 · GBIF 5
Honomū, Kuhua · HawaiʻiiNat 3 · GBIF 3
Kahuku · HawaiʻiiNat 2 · GBIF 4
Pūlehunui · MauiiNat 2 · GBIF 3
Kalaoa 1-5 · HawaiʻiiNat 2 · GBIF 2
Keʻei 2 · HawaiʻiiNat 2 · GBIF 1
Kaʻonoʻulu · MauiiNat 1 · GBIF 1
Pānauinui · HawaiʻiiNat 1 · GBIF 1
Pūlehuiki · MauiiNat 1 · GBIF 1
Kalihikai · KauaʻiiNat 1 · GBIF 1
Manukā · HawaiʻiiNat 1 · GBIF 1
Makawao · MauiiNat 1 · GBIF 1