Glandularia [Seabrook's Lavender] ('Sealav')

RHS Plant Profile

vervain [Seabrook's Lavender]

Synonyms

Glandularia 'Sealav', Verbena 'Seabrook's Lavender', Verbena 'Sealav'

Bedding Herbaceous Perennial

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A spreading half-hardy perennial, to 40cm tall, with ovate leaves to 5cm long. Rounded clusters of small, fragrant lavender-coloured flowers, with a darker eye, are borne in summer

Position

Full sun

Soil Types

Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 1–2 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or East–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H3

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Verbenaceae
Native to GB/Ireland: No
Foliage: Semi evergreen
Habit: Trailing
Genus: Glandularia are annuals or herbaceous perennials, native to The Americas and closely-related to Verbena (and included within Verbena until recently). Showy flowers typically have 5 petals and are held in rounded clusters in summer and autumn
Name Status: Trade

How to Grow

Cultivation

In borders, plant in well-drained soil and full sun. In containers best grown in peat-free compost with added sharp sand.

Propagation

Propagate by semi-ripe cuttings

Suggested planting locations and garden types

Patio and container plants
Cottage and informal garden
Garden edging

Pruning

deadhead regularly to promote flowering

Pests

May be susceptible to aphids

Diseases

May be susceptible to Powdery mildews