Sunstrong™ Yellow Erysimum hybrida

Sunstrong™ Yellow is an upright wallflower in Danziger’s SUNSTRONG™ series, with bright yellow flowers and a long display. Danziger lists early to medium flowering, first-year flowering without cooling, and a mature height of 45–60 cm, spread of 38–45 cm, and zones 6–10 ([Yellow profile](https://www.danzigeronline.com/catalog/perennials_catalog/sunstrong-yellow/) and [series profile](https://www.danzigeronline.com/series_perennials/sunstrong-series/)). ## Placement and season Plan for spring and summer color in a sunny or partly shaded bed or a container with room for a 15–18 inch spread. Danziger describes the series as suitable for landscape planting and pots. North Carolina Extension recommends average to sandy, well-drained soil for Erysimum hybrids and lists borders, rock gardens, and containers as useful settings ([Extension growing notes](https://plants.ces.ncsu.edu/plants/erysimum-x-hybrida/)). ## Maintenance Use a free-draining mix in containers and avoid leaving roots in saturated soil. Remove faded flower stems for a neater display, and replace the plant if it becomes leggy after successive seasons; Erysimum hybrids are often short-lived.