Black-eyed Susan (Hibiscus trionum)

Black-eyed Susan (Hibiscus trionum) is a plant in the annuals and biennials category that can grow 50cm – 1.5m tall and 10cm – 50cm wide. In this growing guide we’ll learn the cultivation details and how to plant Black-eyed Susan (Hibiscus trionum).

This plant has several common names including: black-eyed Susan, bladder hibiscus, bladder ketmia, devil’s head in a bush, flower of an hour, flower of the hour, goodnight at noon, modesty, trailing hollyhock, Venice mallow or Venus’s mallow.

This is a deciduous plant that takes 1-2 years to reach full maturity.

Plant profile

Common name: black-eyed Susan, bladder hibiscus, bladder ketmia, devil’s head in a bush, flower of an hour, flower of the hour, goodnight at noon, modesty, trailing hollyhock, Venice mallow, Venus’s mallow
Scientific name: Hibiscus trionum
Plant type: Annual / Biennial
Habit: Columnar / Upright
Height: 50cm – 1.5m
Spread: 10cm – 50cm
Foliage: Deciduous
Sunlight: Full Sun
Soil: Loam, Sand
Moisture: Well drained
Garden type: City & Courtyard Gardens, Informal Garden, Patio & Container Garden, Sub-tropical
Planting type: Flower borders and bedding

Seasonal colors

Annuals and biennials are ideal for formal or informal flower beds, but also for growing in pots and containers of all kinds. They are important plants for their rapid growth, instant color and relatively low cost.

They are also useful plants for filling spaces between newly planted trees and shrubs, as well as in perennial beds that may need to be revived after the first spring bloom.

They are an important ingredient in country house gardens and wildflower meadows.

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How to plant

In this section we will learn how to plant Black-eyed Susan (Hibiscus trionum), know its needs in terms of soil, watering and sun exposure.

Soil

Black-eyed Susan (Hibiscus trionum) is a plant that prefers to grow in loam or sand.

• The loam soil is dark, rich in organic matter but balanced in minerals. It offers the best of all worlds, retaining enough water for the plants, but allowing excess moisture to drain away. This is the most desired type of garden soil, perfect for most plants.
• Sandy soil is light, porous and very easy to drain. It is a soil poor in organic matter and nutrients. It is composed of relatively large mineral particles that allow water to drain quickly.

As for pH, it is a plant that grows ideally in soils with pH alkaline or neutral.

Regarding drainage, Hibiscus trionum likes to grow in well drained soil.

Sunlight

Black-eyed Susan (Hibiscus trionum) should be grown in full sun places.