Magnify glass

Rosemary Blue Lagoon


Rosmarinus officinalis Blue Lagoon

Weeping evergreen with aromatic foliage and blue flowers

Deep blue flowers smother this plant from early summer onwards. The plant makes an upright bush at first and the branches arch with age to make a tumbling mass of twigs. The flowers are a favourite with butterflies and bees.


Happiest in full sun and very well drained soil at the front of a border or in a container on a sunny patio where the scent of the leaves can be enjoyed, also good for seaside gardens.


Choose a sunny site sheltered from cold winter winds. Prune lightly after flowering to encourage new growth the following year.

Plant details

In depth plant information

Property Value
Plant type Herb, Ornamental shrub
Flower colour
Foliage colour
Typically available March - September
Season of interest Summer
Flowering April - June
Evergreen No
Plant height 35 cm - 40 cm
Plant width 35 cm - 50 cm
Fragrant flowers Yes
Attracts bees Yes
Attracts butterflies Yes
Plant height in 5 years 25 cm
Hardiness zone (?) H4

Will perform best in these conditions

Property Value
Soil type Acid, Chalk, Light sand, Loam
Light exposure Part shade, Full sun
Soil drainage Well drained
Planting instructions

Water the plant in its pot thoroughly before planting – give it a good soaking. Prepare the area by digging a hole twice the size of the pot. Dig compost into the base of the hole. Position the stake in the hole, on the side of the prevailing wind and drive it into the soil, to a depth of 60cm. The stake should be a third of the height of the tree, when planted. Remove the pot and position the plant in the hole close to the stake, with the rootball about level with the surrounding soil. Refill the planting hole with a mixture of garden soil and compost, firming as you go. Use two tree ties to secure the stem to the stake. Water in well and keep well watered during the plant's first year. Check ties regularly and adjust them as the tree grows.

Planting site Rock garden, Cottage garden, Informal garden, Coastal or drought resistant, City garden, Courtyard garden, Flower border and beds, Gravel garden

Additional Information for Fruit, Veg and Bulbs

Property Value
Sowing March - December

Typically available

From March to September