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Perennials

Course CodeBHT316
Fee CodeS2
Duration (approx)100 hours
QualificationStatement of Attainment
Become an expert in Perennials! 
  • Become an expert at the classification, identification and culture of Perennial Garden Plants. 
  • A course equally valuable to landscapers, nurserymen, cut flower growers and garden enthusiasts.
  • Discover what perennials are, which perennial plants are most popular today, their cultural requirements (ie. feeding, watering, soil requirements, pruning, pest control), and learn how to use them to create beautiful landscapes.

Perennials are versatile, beautiful and important to the landscaping industry, as well as the nurseries that grow and supply them. 

Perennials come in all forms, from herbaceous plants that die down in the winter and re-emerge in spring (year after year), to plants that retain their soft-stemmed leafy growth year round. Although beautiful, many perennials are also tough and very much adapted to a variety of climates - ranging from very dry to wet. Some have colourful foliage as well as beautiful flowers, others add architectural interest - but all add excitement and diversity to the landscape or garden as they burst into flower each year.

Lesson Structure

There are 8 lessons in this course:

  1. Introduction
    • Review of the system of plant identification
    • Physiology
    • Information sources
  2. Culture
    • Planting
    • Staking
    • Mulching
    • Watering
    • Feeding
    • Pruning, etc.
  3. Propagation and Hybridization
  4. Review of Major Types of Perennials
  5. Pests & Disease
  6. Irrigation & Hydroponic Culture Techniques
  7. Landscaping with Perennials
  8. Further Uses.

Each lesson culminates in an assignment which is submitted to the school, marked by the school's tutors and returned to you with any relevant suggestions, comments, and if necessary, extra reading.

Aims

  • Describe the identification of Perennial Plants
  • Determine sources of further information for identifying and growing different varieties of perennials.
  • Discuss a variety of cultural techniques used to improve success in growing of different perennial plants
  • Determine the propagation of different perennial plants.
  • Discuss the horticulture of a range of commonly grown perennial genera.
  • Discuss the management of pests and diseases occurring on a range of perennial plants.
  • Manage irrigation and drainage to ensure optimum water levels are maintained for healthy growth in perennials.
  • Determine appropriate use of perennials in a range of horticultural situations.
  • Describe a variety of uses for perennials.

Tips for Gardening with Perennials

A perennial garden is perhaps the ultimate flower garden. Perennials grow fast, are quick to produce flowers, and if you choose the right ones for the right places, can give you an established garden faster than most other types of plants.

When designed and grown well, a perennial garden produces a blaze of colour for many months – starting in spring, flourishing through summer, and beyond into autumn. As one type of flower or foliage finishes, another emerges to give life and colour to the bed.

What is a flowering perennial?
Botanically speaking, a perennial is any plant that lives for more than one or two years. This includes trees and woody shrubs, but most gardeners think of perennials as small flowering shrubs such as geraniums and Margeurite daisies, and herbaceous soft-wooded plants that die back each winter, such as hellebores, campanulas and aquilegias.

 

Types of Perennial Gardens
Perennials can be used in just about any garden situation, but are most commonly used in flowering borders, rock gardens, cottage gardens, feature beds or tubs.

Secrets of Success
Perennial displays use a great deal of water and nutrients, hence soil conditions need to be the very best at all times. Some do like shade but the majority prefer sunny positions.

Maintenance Tips
Pay attention to the following for best results:
• Soil – because they grow fast, they react faster to adverse conditions. Most grow best in moderately fertile, well-drained soil.
• Feeding – fast growth means heavier demand on nutrients, so attention to feeding and watering is very important. Dig aged compost and manure into the soil before planting and spread blood and bone around the plants in late winter. Additional liquid feeds will boost growth during the warmer weather.
• Pest control – tender soft foliage is generally more attractive to pests and diseases than harder drier tissues, so many perennials are subject to pests and diseases. In particular, watch out for snails and slugs.
• Staking – being tender, the stems of herbaceous perennials are more likely to break in strong wind than woody plants. Bamboo stakes are sufficient for most perennials – taller, spreading plants may need three or more stakes.
• Deadheading – removing dead flowers, fruits and damaged leaves frequently will both keep the plants looking more attractive and minimises pest and disease problems. For most perennials, weekly deadheading in summer is ideal.
• Lift, divide and replant herbaceous perennials in late autumn or early winter, about every three or four years.

 

Designing a Perennial Display
The aim is to have the plants flowering in a sequence – as one plant emerges, another finishes and is either cut back or dies down. Plants with interesting foliage colours or textures are used as fillers and as contrasts.

For most beds, a three-tiered arrangement is effective:
• Structural plants for height at the back of the bed
• Medium-sized plants in the middle
• Lower-growing border plants in front

In general, plants look better growing in groups, clumps or ribbons. Plant in groups of at least three specimens for each flower type, and preferably more for larger beds.  Aim for a crowded effect, as this will give a better display and will keep down the weeds.

It may take a season or two to work out the best display but if you’re not happy with the effect, most perennials can be easily moved in the cooler weather.

WHAT ABOUT BEHIND?
Put a hedge, large shrubs, fence, or a trellis covered by roses etc as a backdrop to a perennial bed.

PLANTS for PERENNIAL GARDENS

Structural Plants
Delphiniums, Echium, Hollyhocks, Lobelia, Lupins, NZ Flax, Yucca,

Medium Plants
Achillea, Chrysanthemum, Echinacea, Eryngium, Geraniums & Pelargoniums, Geum
 Hosta, Physostegia, Rudbeckia, Salivia

Border Plants
Ajuga, Allium, Erigeron, Helleborus, Pinks, Primrose, Pulsatilla, Saxifraga, Scabiosa,
Viola

WHAT NEXT?
Register to Study -Go to panel toward top of this page (right column)
or
Get Advice -Use our FREE COUNSELLING SERVICE to contact a tutor
 


Meet some of our academics

Maggi BrownMaggi is regarded as an expert in organic growing throughout the UK, having worked for two decades as Education Officer at the world renowned Henry Doubleday Research Association. She has been active in education, environmental management and horticulture across the UK for more than three decades. Some of Maggi's qualifications include RHS Cert. Hort. Cert. Ed. Member RHS Life Member Garden Organic (HDRA) .
Diana Cole B.A. (Hons), Dip. Horticulture, BTEC Dip. Garden Design, Diploma Chartered Institute of Personnel & Development, PTLLS (Preparing to Teach in the Life Long Learning Sector), P.D.C. In addition to the qualifications listed above, Diana holds City & Guild construction qualifications and an NPTC pesticide spraying licence (PA1/PA6). Diana runs her own landscape gardening business (Arbella Gardens). Active in many organisations including the British Trust for Conservation Volunteers.
Yvonne SharpeRHS Cert.Hort, Dip.Hort, M.Hort, Cert.Ed., Dip.Mgt. Over 30 years experience in business, education, management and horticulture. Former department head at a UK government vocational college. Yvonne has traveled widely within and beyond Europe, and has worked in many areas of horticulture from garden centres to horticultural therapy. She has served on industry committees and been actively involved with amateur garden clubs for decades.
Gavin ColeB.Sc., Cert.Garden Design. Landscape Designer, Operations Manager, Consultant, Garden Writer. He was operations manager for a highly reputable British Landscape firm (The Chelsea Gardener) before starting up his own landscaping firm. He spent three years working in our Gold Coast office, as a tutor and writer for Your Backyard (gardening magazine) which we produced monthly for a Sydney punlisher between 1999 and 2003. Since then, Gavin has contributed regularly to many magazines, co authored several gardening books and is currently one of the "garden experts" writing regularly for the "green living" magazine "Home Grown".


Check out our eBooks

Growing and Using Perennial PlantsWhen designed and grown well, a perennial garden produces a blaze of colour for many months – starting in spring, flourishing through summer, and beyond into autumn.
Climbing PlantsDiscover which climbers to use to hide unsightly walls; how to grow green, flowering boundaries for privacy; and which climbers are the best for growing on the roofs of pergolas, arches and arbours. Chapters cover how plants climb, how to use them, and landscaping. The bulk of the book, however, is given over to an encyclopaedia covering 54 genera and hundreds of species, followed by two separate and more in-depth chapters: one on Bougainvillea and the other Clematis.
HerbsHerbs are fascinating plants, mystical and romantic. They have a rich history dating back centuries. Used by monks, apothecaries and ‘witches’ in the past, herbs are undergoing a revival in interest. They are easy to grow, scented, culinary and medicinal plants. In a formal herb garden or peppered throughout the garden, herbs rarely fail! Find out how they are used as medicines, for cooking, perfumes and more. This book has nine chapters covering the following topics: an introduction to herbs, cultivation, propagation, pest and diseases, herb gardens, an A-Z plant directory, using herbs, features for herb gardens, herbs in pots - 113 colour photos 61 pages
Growing and Knowing Dianthus and CarnationsIdentify carnations and dianthus with ease and get to know the ideal growing conditions that they need to prosper and produce beautiful flowers.