WAEC SSCE Agricultural Science
Study notes for Common types of ornamental plants — part of the WAEC SSCE Agricultural Science syllabus. 5 learning objectives with explanations and exam tips.
Ornamental plants are grown mainly for their beauty rather than food or medicine. They're classified into different groups based on what we use them for. Some ornamental plants are grown for their attractive flowers, like the colourful bougainvillea that decorates many Nigerian homes and gardens. Others are valued for their interesting foliage or leaves, such as the croton plant with its brilliantly coloured leaves. We also have plants grown for their fragrance, like jasmine which releases lovely scent in the evening. Some ornamental plants serve practical purposes too—climbing plants like ivy can cover unsightly walls, while hedging plants create beautiful garden boundaries. In Nigeria, we commonly use plants like ixora for flowers, dieffenbachia for foliage, and scented geraniums for fragrance. Understanding these different uses helps you appreciate why people grow specific plants in gardens and home environments.
Bedding plants are ornamental flowering plants grown mainly for decorating gardens, homes, and public spaces. They're called "bedding plants" because they're typically planted close together in flower beds to create colourful, eye-catching displays. Most bedding plants are herbaceous, meaning they have soft stems rather than woody ones, and they flower abundantly throughout the growing season.
Common examples include marigolds, which you'll see in many Nigerian gardens during the rainy season, producing bright yellow and orange flowers. Other popular bedding plants are petunias, zinnias, and impatiens. These plants are relatively easy to grow and maintain, making them perfect for beautifying school compounds, hospitals, and residential areas. They're usually started from seeds in nurseries, then transplanted into prepared beds once they're strong enough.
Hedging plants are ornamental plants grown closely together in rows to form living fences or boundaries around properties and gardens. They serve both decorative and functional purposes by creating attractive natural barriers while marking land boundaries. These plants are typically evergreen or deciduous species that can tolerate regular trimming and pruning to maintain desired shapes and heights.
Common hedging plants in Nigeria include the Bougainvillea, which produces vibrant coloured flowers and adapts well to our tropical climate. Other examples are Hibiscus and Croton plants. When planted in lines and properly maintained through regular pruning, hedging plants create neat, attractive borders while providing privacy and windbreaks for residential and commercial properties.
The key characteristics of good hedging plants include dense foliage, ability to withstand pruning, and reasonable growth rates. They should also be resistant to pests and diseases common in the region.
Lawn grasses are plants deliberately grown to cover ground areas, making environments look beautiful and neat. These grasses grow close together, creating a soft, green carpet perfect for homes, schools, and public spaces. Common types include Bermuda grass and carpet grass, which thrive well in Nigerian tropical climates. Bermuda grass is particularly popular around Lagos and other southern regions because it tolerates heat and requires moderate maintenance. Lawn grasses serve both aesthetic and practical purposes—they prevent soil erosion, reduce dust, and provide comfortable spaces for relaxation and recreation. Most lawn grasses need regular watering, mowing, and occasional fertilizer application to remain healthy and attractive. They're relatively affordable to establish compared to other ornamental features.
Ornamental plants are plants grown mainly for their beauty rather than for food or medicine. These plants make our environments look attractive with their colourful flowers, interesting leaf shapes, or pleasant textures. You'll find them in gardens, homes, offices, and public spaces across Nigeria.
Common types include flowering plants like roses and hibiscus, which produce beautiful coloured blooms. Foliage plants have attractive leaves in various shades of green, purple, or variegated patterns. Succulent plants like aloe vera store water in their leaves and require minimal care. Climbers and creepers grow along walls and structures, creating living decorations.
In Nigeria, bougainvillea is an excellent example of ornamental plants. Its vibrant pink, purple, or red bracts make it popular for decorating homes and gardens. The plant thrives in our tropical climate and requires little maintenance.