Establishing a nursery for cut flowers is a foundational step in the commercial production of floriculture crops. In Kenya, where floriculture is a key contributor to agricultural exports and local employment, the success of cut flower farming heavily depends on the careful selection and preparation of the nursery site. This chapter explores the critical considerations in selecting an appropriate nursery site, the definition of cut flowers in the horticultural context, and the tools and equipment necessary for nursery establishment. Understanding these aspects equips horticulture professionals with the practical knowledge to optimize nursery productivity and flower quality.

1.1 Nursery Site Selection

Nursery site selection is a strategic decision that affects the growth, health, and yield of cut flowers. In Kenya’s diverse agro-climatic zones, choosing the right location involves balancing environmental conditions with logistical and economic factors. This section delves into the definition of cut flowers, the importance of site selection questions, factors influencing site choice, and the essential tools and materials used in nursery establishment.

1.1.1 Definition of Cut Flowers

Cut flowers are fresh flowers harvested from plants and intended for ornamental use, usually in floral arrangements or bouquets. They are distinguished from potted or garden plants because they are grown specifically for their blooms to be cut and sold. The quality of cut flowers depends on attributes such as vase life, freshness, color, and stem length, which are influenced by cultivation practices starting at the nursery stage.

Characteristics of Cut Flowers

• Freshness and Longevity: Cut flowers must maintain freshness for several days after harvesting to meet market standards in Nairobi flower markets or export destinations.
• Stem Strength and Length: Strong, long stems are essential for arranging flowers and for transportation durability.
• Uniformity and Appearance: Flowers should exhibit uniform size, color, and shape to appeal to buyers in retail outlets and hotels.
• Disease-Free Quality: Cut flowers must be free from pests and diseases to ensure they do not deteriorate quickly or infect other plants.
• Rapid Growth Cycle: Many cut flowers are bred to have quick growth and flowering cycles to maximize production turnover.

In Kenya, popular cut flowers include roses, carnations, and alstroemeria, each requiring tailored nursery conditions to thrive.

1.1.2 Importance of Nursery Site Selection Questions

Selecting a nursery site is not merely a matter of available land but involves critical questions that determine the viability and sustainability of cut flower production. Addressing these questions helps avoid costly setbacks such as poor plant establishment, disease outbreaks, and low yields.

Key Reasons to Ask Site Selection Questions

• Optimizing Growth Conditions: Understanding soil quality, water availability, and microclimate ensures plants receive ideal growing conditions, as seen in successful farms around Thika and Naivasha.
• Reducing Pest and Disease Risks: Site history and neighboring land use affect pest populations and disease pressure on young plants.
• Enhancing Operational Efficiency: Proximity to markets, labor availability, and infrastructure reduce production costs and post-harvest losses.
• Ensuring Environmental Compliance: Questions about drainage and waste disposal are critical to meeting NEMA regulations and avoiding environmental degradation.
• Planning for Expansion: Evaluating site size and future land availability supports business growth without relocation disruptions.

These questions guide horticulturists in making informed decisions that align with both agronomic and business goals.

1.1.3 Factors Considered When Siting a Nursery

The selection of a nursery site involves multiple factors that collectively influence plant health and operational success. These factors encompass environmental, economic, and logistical aspects relevant to Kenya’s horticultural landscape.

Environmental Factors

• Soil Type and Fertility: Well-drained loamy soils rich in organic matter are preferred to support root development and nutrient uptake. For example, many successful flower nurseries in Kiambu County utilize volcanic soils with good structure.
• Water Availability and Quality: Reliable access to clean water is essential for irrigation and misting, especially during dry seasons. Water sources should be free from salinity and contaminants that can harm seedlings.
• Climate and Microclimate: Temperature, humidity, and sunlight exposure affect flowering and disease incidence. Nurseries near Lake Naivasha benefit from moderated temperatures and humidity suitable for roses.
• Topography: Flat or gently sloping land facilitates drainage and ease of management while reducing erosion risks.
• Wind Protection: Sites with natural or artificial windbreaks prevent physical damage to delicate seedlings and reduce moisture loss.

Economic and Logistical Factors

• Accessibility to Markets and Inputs: Proximity to urban centres like Nairobi or Eldoret reduces transport costs for seedlings and cut flowers.
• Labor Availability and Costs: Areas with accessible skilled labor reduce operational challenges, as observed in horticultural hubs such as Thika.
• Infrastructure and Utilities: Availability of electricity, roads, and storage facilities supports nursery operations and post-harvest handling.
• Land Tenure and Legal Status: Secure land ownership or lease agreements prevent disputes and support long-term investment.

Social and Environmental Considerations

• Community Relations: Sites near communities should consider potential conflicts and social impact.
• Environmental Impact: Avoiding ecologically sensitive areas aligns with Kenya’s environmental protection policies.

1.1.4 Tools, Equipment and Materials Used

Establishing a cut flower nursery requires specific tools and materials to prepare the site, propagate plants, and maintain optimal growing conditions. The right selection and maintenance of equipment enhance efficiency and plant quality.

• Soil Testing Kits enable nursery managers to determine soil suitability and nutrient amendments required, ensuring seedlings receive balanced nutrition.
• Watering cans provide controlled manual irrigation, essential during early seedling stages or in small-scale nurseries.
• Propagation trays facilitate uniform germination and ease of handling young plants before transplanting.
• Misting systems are critical in commercial nurseries to maintain high humidity levels, reducing transplant shock and promoting root development.
• Pruning shears assist in clean cuttings for propagation and maintaining plant health by removing diseased or excess growth.

Proper maintenance includes regular cleaning of tools to prevent disease spread, checking irrigation systems for blockages, and calibrating soil testing kits for accurate readings.

Chapter Summary

This chapter covers the establishment of a cut flowers nursery, beginning with the essential process of nursery site selection. It explains what cut flowers are and highlights the critical questions to consider when choosing a suitable site. The factors influencing site selection are examined alongside the tools, equipment, and materials required, such as pangas, jembes, slashers, rakes, seeds, splits, and suckers. The preparation of the nursery follows, detailing how to ready the land for planting. The chapter then addresses the proper methods for planting seeds within the nursery environment. Comprehensive nursery management practices are discussed, including mulching, shading, hardening off, watering, fertilizer application, pest and disease control, and pricking out to ensure healthy growth. Finally, practical steps for carrying out nursery bed preparation, planting, and ongoing management are outlined to support effective nursery operations.