How to Tell If You've Miscalculated the Number of Plants

Short answer: You have too many plants when they block light and paths, suffer from poor airflow, or need constant moving; too few leaves gaps and weeds. Calculate from mature size: a 1.5 m-wide shrub commonly needs 0.8–1 m spacing for a dense planting and 1.5–2 m for free growth.

Obvious Signs of Too Many Plants

Excessive planting density, often called “overcrowding,” doesn't manifest immediately but has serious consequences for plant health and the overall appearance of the garden.

• Stunted Growth and Development: Plants begin to compete for light, water, and nutrients. Young shoots become thin and elongated, leaves shrink, and flowering weakens or doesn't occur at all. Mature shrubs, designed to reach 1.5 meters in width, might only reach a meter, choked by their neighbors.
• Increased Humidity and Diseases: Dense plantings hinder air circulation, creating ideal conditions for the development of fungal diseases and pests. Leaves remain wet longer after rain or watering, which promotes powdery mildew, rust, and other infections.
• Difficulty in Care: Weeding, loosening the soil, pruning, and treating plants become laborious or even impossible. To reach the center of a bush, you might have to damage neighboring plants, which also increases the risk of diseases.
• Loss of Aesthetics: Instead of lush, neat compositions, you get chaotic thickets where each plant loses its individuality. Paths and recreation areas can become overgrown, narrowing passages that were originally planned to be 0.8-1.2 meters wide.

Signs of Too Few Plants

An insufficient number of plants, or “under-planting,” also spoils the landscape but manifests quite differently.

• Empty Spaces and "Bald" Spots: The garden looks unfinished, lacking volume and fullness. Even after 3-5 years, when plants should have reached their mature size, visible gaps remain, disrupting the integrity of the composition.
• Lack of Shade and Privacy: If you were counting on a hedge or tall shrubs for seclusion or shade, an insufficient number won't be able to fulfill these functions. Neighbors will still see your garden, and on a hot day, there will be nowhere to escape the sun.
• Monotony and Lack of Expressiveness: Compositions appear flat, lacking color accents, height transitions, and volume. The design looks simplistic, without the depth and layering that properly selected and arranged plants provide.
• Increased Weed Growth: Empty spaces between plants are quickly filled with weeds, requiring constant weeding and increased maintenance, instead of the plants themselves suppressing the growth of unwanted vegetation.

Common Errors When Calculating Plant Quantities

You can avoid problems with plant quantities by knowing the most common errors and considering them during planning.

• Ignoring Mature Plant Sizes: The most common mistake is planting based on the seedling's current size, rather than its potential mature dimensions. A small bush that looks cute in the nursery might take up 1-2 m² in a few years and choke its neighbors.
• Disregarding Growth Rate: Some plants grow very quickly, others slowly. Fast-growing species, planted too densely, will create thickets in a short time. Slow-growing ones, conversely, will leave empty spaces for many years. For example, a Thuja Brabant can grow up to 2.5 meters tall and 1 meter wide in 5 years, while slow-growing junipers will be significantly smaller.
• "Sale Planting": Impulsive purchase of plants during sales or at a good price without linking them to the overall garden plan. This leads to chaotic plantings and an excess or shortage of certain species.
• Incorrect Zoning: The absence of clear functional zoning of the plot leads to plants being planted without understanding their role. For example, ornamental shrubs in an area requiring maximum privacy, or fruit trees shading the vegetable garden.
• Neglecting Site Conditions: Insufficient consideration of light, soil type, moisture level, and terrain. For example, planting shade-loving plants in full sun or moisture-loving plants in a dry area will lead to their suppression and the need for replacement.

Factors Influencing Accurate Calculation

To avoid errors, it's essential to consider several key factors before starting to plant.

1. Size and Shape of the Plot: The area (in ares or m²) determines the overall scale of landscaping. A 6-are plot requires a different approach than a 20-are one. The shape influences the arrangement of zones and visual perspectives.
2. Functional Zoning: Determine where recreation areas, playgrounds, vegetable gardens, and the front entrance will be located. Each zone has its own plant requirements. For example, a hedge between plots will require a completely different number of seedlings than a small flower bed near the house.
3. Size and Habit of Mature Plants: This is the most crucial parameter. Always focus on the plant's final size. If the chosen shrub reaches 1.5 meters in width, then for dense planting, you should leave at least 0.8-1 meter between them, and for free growth, 1.5-2 meters.
4. Growth Rate: Consider how quickly plants reach their maximum size. For a quick effect, you can combine fast-growing and slow-growing species.
5. Maintenance Requirements and Planting Density: Some plants require a lot of space and individual care, while others thrive in dense group plantings. For flower borders, a density of 5-7 plants per 1 m² is often used, whereas for large shrubs, it might be 1 plant per 2-3 m².
6. Budget: The number of plants directly impacts the project cost. You might need to choose more budget-friendly, yet equally effective, alternatives or spread the planting over several seasons.

Steps for Accurate Calculation

A systematic approach to planning will help avoid most problems.

1. Site Analysis: Study the soil (perform an analysis), determine the light levels at different times of day, assess the terrain, and note any existing plantings. Ensure the fertile soil layer is at least 30-50 cm deep for most plants.
2. Zoning: Divide the plot into functional zones. Determine where open spaces will be and where dense plantings will go. You can read more about this in our article how to zone your plot.
3. Plant Selection by Function: For each zone, choose plants that match its purpose (e.g., tall for privacy, groundcovers for slopes, flowering for accents). Refer to our article on choosing plants for your plot.
4. Scaled Planning: Create a scaled plan of your plot, marking each plant according to its mature size. Use circles or ovs to represent the future canopy.
5. Quantity Calculation: Once you've placed all plants on the plan, count their number for each group or species. Consider the recommended spacing between specimens for the chosen species.
6. Adjustment: Evaluate the resulting plan. Is there enough space for pathways? Are there any areas that are too dense or, conversely, too empty? Make the necessary adjustments.

How to Plan Plant Quantities in FormSpace

FormSpace offers convenient tools for visualizing and calculating plants, helping to avoid errors even at the design stage. Start with module 1.1 "Zoning", to define the functional areas of your plot. Mark where flower beds, hedges, groups of trees, and shrubs will be located. This allows you to see the overall picture and understand how much space you're allocating for landscaping. Then, using module 1.2 "Objects", you can add symbols for different types of plants, setting their estimated mature sizes. This is especially useful for large trees and shrubs that occupy a significant area. You'll immediately see how the chosen plants will interact with each other and with other landscape elements, avoiding overcrowding or empty spaces. For ideas and preliminary assessment, you can use module 2.1 "AI Concept". Upload a photo of your plot and receive several design options with suggested plant species and their arrangements. This will give you a starting point for further detailing. And module 3.1 "Design by Photo" allows you to visualize selected plants directly on a photo of your plot, helping to assess planting density, color combinations, and forms. You can “try on” different options, adjusting the number and arrangement of plants until you achieve the ideal result that matches your expectations and the plot's requirements.

When to Consult a Landscape Specialist

Despite all available tools and advice, there are situations where professional help is indispensable.

• Complex Terrain or Large Plots: If your plot has a significant slope, an unusual shape, or its area exceeds 15-20 ares, planning can become too complex. A specialist can help effectively utilize the space and solve engineering challenges.
• Lack of Time or Knowledge: If you don't have time for an in-depth study of landscape design or feel unsure about botany and agricultural techniques, a designer will save you time and stress by providing a ready-made, well-thought-out solution.
• Desire for a Unique and Complex Design: Creating an original, multi-layered landscape that will be a joy to behold for many years requires deep experience and a creative approach. A professional will consider all nuances and create a bespoke project.
• Problems with Existing Plantings: If the plot is already planted but there are issues with the plants or composition, a specialist can help conduct a review, replan, and save what's possible, or suggest new solutions.

FAQ

Can I plant plants more densely and then thin them out?

Yes, this is a common practice, especially for creating a quick effect or when planting annuals. However, for perennials and shrubs, it requires additional effort and cost: you'll have to dig up and transplant excess specimens, which can damage the root system of the remaining plants. For conifers and large shrubs, this approach is highly undesirable, as they tolerate transplanting poorly in adulthood.

What if plants die after planting?

First, determine the cause of death: it could be disease, pests, unsuitable conditions (soil, light), or improper care. If the cause is eliminated, you can purchase and plant new plants. It's important to choose quality planting material and provide proper care from the start. You might also consider reviewing the species choice if the site conditions proved unsuitable.

How do I account for different plant growth rates in one composition?

The key to success is planning. Arrange fast-growing species so they don't suppress slow-growing ones, or choose slow-growing varieties for mixed plantings. Tall and fast-growing plants are best placed in the background or where they won't shade their neighbors. You can also use formative pruning to control the growth of fast-growing species.

How important is the budget when calculating plant quantities?

The budget plays a crucial role. Often, the desire to save money leads to buying fewer plants than necessary or choosing cheaper but unsuitable species. This can result in needing to purchase more plants later, which ultimately proves more expensive. Plan your budget in advance and, if necessary, divide the planting into stages or consider more budget-friendly, yet equally effective, plant alternatives.

Which plants are suitable for "quick" landscaping?

For a quick effect, annual flowers (petunias, marigolds, lobelias) are suitable, as they quickly fill space and provide abundant blooms. Among perennials, hostas, astilbes, phloxes, and some fast-growing shrubs like Japanese spirea and ninebark can be highlighted. However, remember that fast-growing species require more frequent care and pruning to maintain their shape.

How can I avoid monotony when using a large number of identical plants?

Even when using a large number of one plant species, you can create an interesting design. Vary height and form, use different cultivars of the same species with distinct foliage or flower shades. Combine them with companion plants that will complement them with texture or color. Add accent plants that will stand out against the main mass, creating focal points.

Proper planning of plant quantities is an investment in the beauty and health of your garden. Dedicate enough time and attention to this stage, using available tools and following recommendations. This will help you create a harmonious landscape that will bring you joy for many years.