Day 16 of the perennial plant challenge. Euphorbia characias ‘Glacier Blue’ is a fabulous perennial, especially in the winter and spring. During the fall, enjoy the beautiful grey green leaves edged with thick cream colored edges. Glacier Blue is a strong upright grower to 2 feet tall and wide, and will be evergreen down to 15 degrees F. Then in late winter long stems of glowing white and green flowers emerge and remain on the plant from late winter to mid June. The plants in these photos are growing at the nursery in what I consider the toughest spot to plant – shade in the morning, then cooking hot sun from 1 pm on. Euphorbia in general are wonderful plants for this condition, and ‘Glacier Blue’ is a real winner under this difficult growing condition.
Plant Euphorbia ‘Glacier Blue’ in an area with good drainage, in at least 4 hours of sun. Full sun is great, but not required for a beautiful plant. Give it some elbow room, so it can grow to its full size and show off. This plant will produce a white sap when cut, which can irritate the skin and eyes, and the foliage is toxic, so shouldn’t be planted near livestock.
In a large container this plant grows very well, with minimal water and fertilizer. Plan on a pot at least 16 inches wide and tall, and fertilize every 6-8 weeks with an all purpose fertilizer.