Mistake #21: No Dendro-inventory of Existing Trees

Landscape design begins long before selecting plants and laying paths. It starts with a thorough study of the site, its features, and most importantly, everything that is already on it. Mistake #21, often made by owners and even some novice designers, is the absence of a dendro-inventory of existing trees. This leads to chaotic decisions, the loss of valuable specimens, and unplanned expenses. Instead of relying on visual impressions, it's crucial to have a clear inventory list of every tree and shrub, determining its fate in the project.

The Core Problem: Why is a Dendro-inventory So Important?

A dendro-inventory is not just a botanical treatise, but an inventory list of all living objects on the site, similar to a utility network statement. Maples might already be growing along the boundary, birches at the entrance, or an old apple tree near the kitchen. Without a dendro-inventory, the plan is often drawn "over a green mess," relying on visual impressions. As a result, an excavator accidentally damages a trunk intended for preservation, or a "useless" ash tree turns out to be the only source of shade over the patio. The absence of this document means there's no clear list: species, diameter, height, crown width, number on the plan, and most importantly, the decision — "keep," "remove," or "transplant."

Reasons for Ignoring: Why Does This Happen?

Often, a dendro-inventory is ignored for several reasons. Firstly, a high-quality survey and inventory seem more expensive than "just walking around and looking." A property owner might say, "we'll keep those three trees," and the designer relies on memory or drone photos where tree crowns merge into a single blur. Secondly, there's a misconception that tree species and condition can be clarified during the construction phase, which in practice often leads to the use of a chainsaw instead of a well-thought-out solution. Furthermore, many confuse protected specimens with an ordinary garden, believing that if there's no "nature monument" sign, decisions can be made by eye. However, even a common linden tree with a 40 cm diameter is already a significant structure on the site, not just background.

Consequences: What Does the Property Owner Lose?

The absence of a dendro-inventory leads to serious, often irreversible consequences. Trees that formed viewpoints and microclimate are accidentally removed, and then expensive mature trees must be purchased to compensate for the loss. Or, conversely, "everything" is left, but then a path, septic tank, or entrance runs into trunks that no one numbered or accounted for in the plan. Disputes with neighbors or green space inspectors can arise after trees have been felled, and it's impossible to collect official reports afterward. Transplanting trees "later" is almost always significantly more expensive than a calm inventory at the start of the project. And a lost tree does not regain its former habitus and aesthetic value in a single season.

Step-by-Step Guide: How to Create a Dendro-inventory

To avoid the described mistakes, follow this algorithm:

1. Inventory and Numbering. Before starting the preliminary design, walk around the site with a tape measure and number all trees, starting from a conditional threshold (often 8–10 cm in diameter at the root collar), as well as valuable shrubs.
2. Data Collection. For each numbered tree, enter the following data into a table: species (e.g., Norway maple, weeping birch), trunk diameter, approximate height, crown width, precise reference to the house or fence, and a preliminary decision – "keep," "remove," or "transplant."
3. Mapping onto Topographic Base. Be sure to mark the numbers of all trees on the topographic plan of the site. Without graphical representation on the plan, the inventory remains just a list and loses its practical value.
4. Recording Decisions. Any decision to remove or transplant a tree must be documented in writing and agreed upon with the property owner. Verbal agreements "at the gate" often lead to misunderstandings and conflicts.
5. Archiving. Place the completed dendro-inventory in the project's source data folder, alongside photo documentation of the site's initial state and the boundary demarcation act.

Protected Zones and Legal Aspects

In addition to accounting for tree sizes and conditions, it is crucial to be aware of the existence of protected zones. Some trees may be recognized as cultural heritage objects or have a special conservation status, which imposes restrictions on any work near them. Even ordinary but large trees have root zones where it is not recommended to carry out earthworks or compact the soil to avoid damaging the root system. Ignoring these zones can lead to fines or the need to rework the entire project. Always clarify local regulations and rules regarding green spaces.

Planning with Existing Trees in formspace.design

Integrating existing trees into a new landscape project becomes much simpler and more accurate with modern tools. In formspace.design, you can use module 1.x (plan/zones/objects) to precisely map inventoried trees onto a digital topographic base. After you have conducted an inventory on the site and measured all necessary parameters, you can mark each tree on your plan, indicating its trunk diameter and approximate crown width. This will allow you to visualize how existing trees fit into future functional zones, whether it's a recreation area, a playground, or a utility yard.

If you face complex decisions — to keep, remove, or transplant valuable specimens — formspace.design's module 2.1 (AI concept) can offer various options for zoning and object placement, considering the location of large trees. For example, artificial intelligence might suggest placing a patio in the natural shade of an existing ash tree that you initially planned to remove, or propose optimal path trajectories that bypass root systems. Using module 3.1 (design by photo), you can photograph the current view of the site and overlay elements of the future design to see how new plantings and structures will look next to existing trees before a final decision on their fate is made. This helps avoid Mistake #1: Starting a Project Without a Written Brief from the Owner regarding existing vegetation and make the most informed decision.

FAQ

What is a dendro-inventory and why is it needed?

A dendro-inventory is a detailed list of all trees and valuable shrubs on your property, including their species, dimensions, precise location, and proposed solution (keep, remove, transplant). It is necessary to avoid accidental destruction of valuable plants, prevent conflicts with neighbors or inspectors, and optimize landscaping costs by harmoniously integrating existing trees into the new design.

Which trees should be included in a dendro-inventory?

All trees with a trunk diameter of 8-10 cm or more at the root collar are included, as well as valuable shrubs that are significant for the landscape. It is important to consider not only mature specimens but also young ones that may become significant elements in the future. Even if a tree seems to be of no particular value, documenting it will help avoid disputes and errors in future planning.

Can I do without a dendro-inventory if there are few trees on the property?

Even if there are only a few trees on the property, their precise documentation is extremely important. They can play a key role in forming the microclimate, creating shade, or visual accents. The absence of an inventory can lead to even one or two trees being accidentally damaged or removed, which will entail unforeseen costs for their replacement or the creation of similar conditions.

What if a tree interferes with a planned structure or utilities?

If a tree is in an area where construction or utility lines are planned, a dendro-inventory will help make an informed decision. Perhaps it can be transplanted if it is economically viable and technically feasible, or the project can be altered to preserve the valuable specimen. If removal is unavoidable, a documented decision will help avoid problems with regulatory bodies and fines.

Who should compile a dendro-inventory?

Ideally, a dendro-inventory should be compiled by a landscape architect or dendrologist with the necessary knowledge and experience. However, a property owner can do it themselves using a tape measure, camera, and a detailed site map. The main thing is to be attentive and record all data as accurately as possible so that it becomes a reliable basis for further design.

How does a dendro-inventory help save money?

A dendro-inventory prevents costly mistakes. For example, it helps avoid the removal of valuable trees that would later have to be replaced with large specimens at significant cost. It also allows for advance consideration of protected zones and root circles, so that the project does not have to be redone or fines incurred for violating legislation, which ultimately significantly reduces unforeseen expenses.

How does a dendro-inventory differ from a dendroplan?

A dendro-inventory is a textual table or list containing all information about each existing tree on the property (species, dimensions, condition, decision). A dendroplan, on the other hand, is a graphical representation of all plants (both existing and planned) on the site plan, usually with symbols and an explication. The inventory serves as the source data, based on which the dendroplan is formed, representing a ready-made landscaping solution.

Ignoring existing trees on a property is a mistake that can lead to serious problems and unforeseen expenses. A thorough dendro-inventory, carried out before the start of design work, is the foundation for harmonious and functional landscape design. It allows for informed decisions, preserves valuable natural elements, and integrates them into the overall concept of the property, creating a unique and sustainable space. Use modern tools, such as formspace.design, to make this process as efficient and accurate as possible, and transform your property into an ideal place to live. Start planning today by exploring our step-by-step guide to landscape design.