Overview

Mimulus 'Highland Yellow' is a upright, clump-forming, spreading herbaceous perennial in the genus Mimulus, part of the Phrymaceae family, with deciduous foliage. Mimulus 'Highland Yellow' grows best in full sun and partial shade, and tolerates most soils and any pH. Its UK hardiness is rated H4. Suggested uses include bog gardens, pond margins, cottage gardens and informal gardens.

About

Mimulus 'Highland Yellow' is a herbaceous perennial in the Phrymaceae that forms upright, clump-forming, spreading plants suited to very moist ground. It is deciduous and flowers from June to September. Place it in full sun or partial shade on south-, east- or west-facing sites that are sheltered. It performs best where soil remains consistently moist.

About the genus

Mimulus, also known as monkeyflowers, is a plant genus in the family Phrymaceae, which was traditionally placed in family Scrophulariaceae. The genus now contains only seven species, two native to eastern North America and the other five native to Asia, Australia, Africa, or Madagascar. In the past, about 150 species were placed in this genus, most of which have since been assigned to other genera, the majority to genus Erythranthe.

Wikipedia contributors, "Mimulus", CC BY-SA 4.0 — Mimulus

In the garden

Mimulus 'Highland Yellow' belongs to the genus Mimulus within the Phrymaceae and is grown as an ornamental for moist planting positions. Members of the genus favour wet ground and this cultivar follows that pattern, making it appropriate where irrigation is difficult to maintain. The plant is deciduous and produces its display between June and September. Give it a position in full sun or partial shade on a south-, east- or west-facing aspect with some shelter from strong winds. Soil can be loam, sand, clay or chalk and is tolerant of a wide pH range (acid to alkaline), but it requires moist to very moist conditions and is not drought tolerant. Hardy to H4 (average), it will survive typical UK winters but benefits from protection in exposed sites. Use Mimulus 'Highland Yellow' at pond margins, in bog gardens, and informal or cottage borders where moisture is retained. Plant so the rootball is firmed into damp soil and avoid letting the crown dry out. Divide congested clumps in spring to rejuvenate growth. Expect upright flowering through the summer and a clear die-back to deciduous foliage afterwards.

Growing conditions

Best soil and position for Mimulus

Sunlight

Full sun, Partial shade

Soil type

Loam, Sand, Clay, Chalk

Soil pH

Acid, Neutral, Alkaline

Soil moisture

Moist, Very moist

Aspect

South-facing, East-facing, West-facing

Exposure

Sheltered

UK hardiness

H4

Plant details

Mimulus 'Highland Yellow' size, habit and characteristics

Plant type

Herbaceous Perennial

Habit

Upright, Clump-forming, Spreading

Foliage

Deciduous

Suggested uses

Bog gardens, Pond margins, Cottage gardens, Informal gardens

Care notes

Pruning and caring for Mimulus 'Highland Yellow'

Propagation

Seed, Division

Pest resistance

Susceptible to slugs and snails

Disease resistance

Susceptible to powdery mildew

Frequently asked questions