Cultural requirements are the same as other Rosemaries; that is, full sun and good drainage. It takes plenty of water provided the drainage is good, but should also prove to be very drought resistant. No other unusual cultural requirements have been observed to date.

In the open ground, Rosmarinus officinalis Irene (cv: 'Renzels' P.P. 9124) produces horizontal growth of 18-36" per year in California (irrigated plants put on considerable growth in the fall). Height observed to date ranges from 12-24". Its habit has been described as "hummocky", for it does not display as much of the wiry or octopoid growth habit of 'Prostrata'. It tends to produce, vigorous, more upright stems than 'Prostrata', but with a little pruning, its horizontal and prostrate habit is readily displayed.

Flower size is larger than 'Prostrata' and more deeply saturated with blue-violet. It has the richest blue flowers of any vigorous trailing form of rosemary. This saturation prevents the flowers from bleaching out in spells of hot weather. In Northern California, it regularly blooms in the late summer, early fall when irrigated, as well as the usual late winter (February) and spring. Its tends to flower more profusely than other trailing rosemaries. Cold hardiness has not been thoroughly tested. It should be at least as hardy as 'Prostrata'. It has survived a winter low of 15 degrees. Leaf colour is a good medium green. The plant does not display any of the gray-green common to many Rosemaries. Leaf size is larger that 'Prostrata'
Spacing of plants in regular soils should be 6' on centre.