Solanum diphyllumL.

twoleaf nightshade

WFO wfo-0001027594 Accepted WFO 2026-06 8 photographs CC BY

Plate 1 figs. a–h · 8 separate observations

Solanum diphyllum, photographed by Pranav Chandra Bose
fig. a Pranav Chandra Bose, CC BY 4.0 / 2022-06-11 / obs. 205157433

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Flowering 209 in flower of 502 examined

Proportion of examined Solanum diphyllum in flower, by month
Month In flower Examined Share 95% interval
Jan 3 23 13% 5% to 32%
Feb 2 12 17% 5% to 45%
Mar 14 24 58% 39% to 76%
Apr 68 96 71% 61% to 79%
May 26 42 62% 47% to 75%
Jun 10 42 24% 13% to 39%
Jul 16 43 37% 24% to 52%
Aug 21 41 51% 36% to 66%
Sep 17 36 47% 32% to 63%
Oct 12 57 21% 12% to 33%
Nov 9 47 19% 10% to 33%
Dec 11 39 28% 17% to 44%

Peak flowering in Apr. Each bar is the share of Solanum diphyllum observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 209 of 502 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Where it actually grows measured, from 1,939 observations

Condition 5th percentile Median 95th percentile
Coldest month, mean daily low 10.9 °C 13.3 °C 20.8 °C
Warmest month, mean daily high 28.6 °C 30.3 °C 32.5 °C
Annual rainfall 1,262 mm 2,152 mm 3,636 mm
Rainfall in the driest quarter 54 mm 165 mm 616 mm

It is not found anywhere that gets close to freezing. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 1,939 research-grade observations of Solanum diphyllum that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one. Climate from CHELSA V2.1 (Karger et al. 2017); occurrences from 10.15468/dl.cgje2x.

Also published as 1 synonym

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Pseudocapsicum diphyllum (L.) Medik.

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite. It has no native range either: Kew's checklist does not cover this taxon.