Blue sea holly
I planted 2 of the Holly. One is doing great, the other not so much. Same area, same conditions. Are there any suggestions to try to save the one plant.
Eryngium zabelii 'Big Blue' should be planted in full sun and receive regular watering to establish a deep root system.
Not every plant will grow at the same rate. Give the struggling plant more moisture if needed. If you have trees or other plants in the area, it could be taking the moisture.