What's new on 'Sunbeckia' hardiness

“What’s new on ‘Sunbeckia’ hardiness” will give an update on our last insights in Bull Plant Genetics Rudbeckia ‘Sunbeckia’ winter performance.

Even if the Rudbeckia ‘Sunbeckia’ is a Rudbeckia hirta, this modern series out of Hartwig Bull’s breeding program shows imposing hardiness results.

The first frosty night with -2° C / 28° F are not the deadly end of the ‘Sunbeckia’.

After the some hours back in the temperature range of 8-10 °C / 46-50 °F, the ‘Sunbeckia’ varieties are doing fine again.

Don’t plan on it, but don’t be afraid as well.

‘Sunbeckia’ hardiness in Winter 2024/25

‘Sunbeckia Carla’ State New York

The picture on the right side shows some ‘Sunbeckia Carla’ planted in ground in June 2024. This photo from April 2025 shows how good they are coming back.

Below you see the beautiness of a ‘Carla’ in summer.

2nd flush on a ‘Carla’ in Oregon summer 2023

‘Sunbeckia’ Specialties in Cairo GA

The Bull Plant Genetics specialties ‘Caramel’, ‘Peach’, ‘Scarlet’ and ‘Cherry’ did overwinter in Cairo GA in pots. Suffering by frost and snow, these plants came back in their pots and without any cover or protection.The pictures from 07. April 2025 are showing the hardiness of this group.

‘Sunbeckia Luna’ and ‘Mia’ in Charleston SC

In Charleston SC in the “Abide a While” gardencenter some ‘Sunbeckia’ have been planted in ground. More than just coming out of the ground, the ‘Luna’ and the ‘Mia’ starting already to flower. Even if Charleston SC has mild winters, the ‘Sunbeckia’ is willing to stay!

With our post “What’s new on ‘Sunbeckia’ hardiness” we like to point out that the ‘Sunbeckia’ series is not just a Rudbeckia hirta annual type. The USDA hardiness Zone 7-8 makes the ‘Sunbeckia’ series to a serious plant for landscape with great effects.