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Silphium perfoliatum (Cup Plant)


Date Action
Sep 04 2011Netty (13946) added "4a (to -25 F / -32 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "4b (to -20 F / -29 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "5a (to -15 F / -26 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "5b (to -10 F / -23 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "6a (to -5 F / -21 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "6b (to 0 F / -18 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "7a (to 5 F / -15 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "7b (to 10 F / -12 C)" to Zones / Hardiness
Sep 04 2011Netty (13946) added "8b (to 20 F / -7 C)" to Zones / Hardiness
Aug 12 2009Frank (2698) updated "cup plant" to "Cup Plant" in Common Names