Senetti provides high impact color when we need it the most. In vivid blues, magic magentas, ultraviolets and stunning bicolors, where else can you find vibrant color early in the season? Plant Senetti with other cool companion bedding plants in early spring, such as pansies. Senetti thrives in full sun and partial sun conditions.is the perfect solution for your borders and pots this spring. They thrive in lower temperatures, making them well-suited for the British garden.