Site Analysis and Project Planning

What Is a Site Analysis?

A site analysis is the systematic process of gathering every piece of information about a property before a single plant goes in the ground or a single line is drawn on a design. Professional landscape designers and horticulturists do not guess — they measure, test, observe, and ask questions. A thorough site analysis protects you legally, helps you meet client expectations, and produces landscapes that thrive rather than fail. In this capstone lesson you will perform a full professional-grade site analysis and turn your findings into a written scope of work and a preliminary concept plan.

Step 1 — Measured Site Survey and Base Plan

Begin by walking the entire site to get a general feel for its shape, grade changes, and existing features. Then use a 100-ft measuring tape or a measuring wheel to record all boundary lengths, the locations of structures, hardscape, existing trees, utility access points, and any other permanent features. Measure from at least two fixed reference points so you can re-create the layout accurately.

Sketch your findings on graph paper using a consistent scale — a common choice is 1 inch = 10 feet, though you should choose whatever scale fits the site on your sheet. Label north on every sketch; use a compass if you are unsure. Transfer the sketch to landscape design or CAD-lite software to create a clean digital base plan. The base plan is the foundation every other step builds on.

Safety note: Before probing or digging anywhere on site, confirm that underground utilities have been located. In the United States, call 811 (the national "Call Before You Dig" number) at least a few business days before any soil disturbance. Wear closed-toe shoes or boots on site at all times. Be aware of traffic if the site borders a road.

Step 2 — Soil Sampling and Testing

Soil is the single most important factor in plant health. Collect samples from at least three locations on the site — areas that look or feel different from one another, such as a sunny slope, a shady corner, and a planting bed. Use a clean trowel or soil probe to collect soil from the root zone depth (roughly the top 6 to 8 inches). Place each sample in a labeled bag.

Perform two quick field tests on-site:

• Ribbon test (texture): Moisten a small amount of soil and squeeze it between your thumb and forefinger. Sandy soils will not ribbon; loam ribbons a short distance; clay soils form a long, smooth ribbon. This tells you the texture class.
• Jar test (texture confirmation): Fill a clear jar about one-third with soil, add water to nearly full, shake vigorously, and let it settle. Sand settles first, then silt, then clay rises last. The proportions of each layer identify the texture class.

Record pH, texture class, and a drainage rating (well-drained, moderately well-drained, poorly drained) on your standardized site-analysis form. Submit one composite sample — made by mixing equal portions from each sampling location — to a soil testing lab or run it through an in-class soil test kit for nutrient and pH data.

Safety note: Wear nitrile or rubber gloves when handling soil to avoid contact with potential contaminants, especially on previously developed or industrial sites. Wash hands thoroughly afterward.

Step 3 — Sun Mapping and Drainage Assessment

Observe and record light conditions across the site at different times of day if possible, or use your knowledge of the compass orientation and nearby structures to estimate sun and shade patterns. Mark areas as full sun (6 or more hours of direct sun per day), part sun/part shade (3 to 6 hours), or full shade (fewer than 3 hours). Note any seasonal shade created by deciduous trees.

For drainage, look for signs of standing water (algae, moss, water-loving weeds, soil staining), note the slope direction using your base plan, and observe whether downspouts or impervious surfaces direct runoff toward planting areas.

Step 4 — Client Interview

Use a prepared questionnaire to conduct a structured interview with your client. Good client interviews ask about: intended use of the space (entertaining, play, food production, curb appeal), maintenance capacity (time and budget available for upkeep), aesthetic preferences (formal vs. informal, color preferences), budget range, timeline, and any known site problems they have experienced.

Document answers completely. Your notes become part of the official project record.

Step 5 — Scope of Work and Preliminary Plant Palette

Combine your site-analysis data and client-interview notes into a written scope of work. This document lists: site constraints (poor drainage, compacted soil, shade, deer pressure, etc.), client priorities in ranked order, budget range, plant hardiness zone (verified against the current USDA Plant Hardiness Zone Map), and a preliminary plant palette of at least eight species. Select plants from your regional extension plant-selection guides to ensure they are proven performers in your climate and soils. Note each plant's sun requirement, water need, and mature size.

The scope of work is a professional communication tool. It protects both the designer and the client by making expectations explicit before work begins.

Connecting to Your Credentials

The NALP Landscape Industry Certified exam tests site-assessment skills, plant identification, and the ability to match plants to site conditions — all of which you practice here. Your State Pesticide Applicator license requires understanding site conditions because label directions often specify application rates that depend on soil type, drainage, and plant species present. The work you do in this lesson builds the professional foundation both credentials assume you have.