Quick answer
Plant spacing is the distance left between plants when you set them in a bed, usually measured from the center of one plant to the center of the next and chosen to fit each plant’s mature size instead of its size at planting.
Too close and plants crowd, shade and compete. Too far and the bed stays bare and weedy for years. No single distance fits every plant, so extension offices teach a method, not a number.
Quick facts
The key facts about Plant Spacing, with sources:
- The base rule
- Space plants by mature size, not by the size you buy them; the tag usually lists mature height and width but should be double-checked 1
- Worked example from UGA
- A dwarf yaupon holly reaches about 8 feet high and wide, so ideal spacing is 8 feet apart 1
- Sheared hedge
- Subtract about 2 feet from the mature width so canopies overlap slightly (UGA) 1
- Next to a house
- Shrubs over 6 feet tall: foliage at least 5 feet from walls. Under 6 feet: at least 3 feet (Clemson) 3
- Perennials
- Mature size, or the size reached in the third year of growth (UGA) 2
- Ground covers
- Most are spaced 6 inches to 2 feet apart (UNH) 8
Key takeaways
- Plant for the size a plant will become. A one-gallon shrub can spread many feet. UGA’s Gary Wade writes that it is hard to imagine small one-gallon plants growing 10 feet wide within five years 1.
- Crowded plants compete for space, light, water and nutrients. Their inner leaves die, air moves poorly and insects and disease find stressed plants 1.
- Spacing is measured on center, from the middle of one plant to the middle of the next. Clemson says plants should be set on center to allow for mature spread 5.
- Tags can be wrong. UGA found a tag that listed 12 to 15 inches for hollies that grow 12 to 15 feet, so check a second source 1.
- Keep tall shrubs away from the house: Clemson asks for at least 5 feet from walls for shrubs over 6 feet tall 3.
The gap between plants, set for the future
When you plant a bed, you choose how much bare soil sits between plants on day one. That gap is the plant spacing. It looks wide when plants are young, because most of what you plant is small.
University of Florida extension gives the design rule for beds: space the individual plants so that they touch each other when they reach their mature size 6. Plants are spaced for their mature width, not their width at planting.
The term is not the same as plant density, which counts plants per square foot, or layout, which is the pattern. Spacing is the distance. Our page on ground cover plants covers dense plantings, and raised garden beds covers food beds.
This page explains how extension sources reason about distance. It does not give a distance for every plant, because mature size differs by species and cultivar. For a planting job, read our planting and garden beds guide.
Why distance matters: space, light, air and disease
Competition. When plants grow into each other they begin competing for space, light, water and nutrients. Interior foliage dies, and air circulation within the canopy is restricted. The plants become stressed and more susceptible to insect and disease problems, says UGA 1.
Airflow and disease. Clemson says proper spacing provides good air circulation among plantings and lowers disease risk and root competition 4. Colorado State says warm, humid air creates ideal conditions for powdery mildew, and that overcrowded perennials bloom poorly 7.
Crowding and shade. Plants not given adequate space will eventually outgrow an area, leading to crowding or excessive shading 4.
The other side. UGA’s perennial guide adds that when plants are set too far apart, more mulch will be needed to control weeds, and that some perennials do not do well when young plants compete for resources 2. Spacing is a trade-off between crowding later and bare soil now.
- Read the tagMature height and width, not pot size
- Check a second sourceA horticultural reference, extension page or nursery
- Pick the ruleTouch at maturity, on center, or hedge overlap
- Stage the potsSet them out and look before you dig
- Measure and plantOn center, with room from walls and paving
Spacing rules compared, as each source prints them
| Situation | What the source says | Source | Watch for |
|---|---|---|---|
| Beds in general | Space plants so they touch when they reach mature size | UF/IFAS 6 | A plant tag for mature width |
| Single shrubs | Spacing equals mature width; a dwarf yaupon holly of about 8 by 8 feet is spaced 8 feet apart | UGA 1 | Cultivars of one species differ |
| Sheared hedges | Subtract about 2 feet from the projected mature width; 12 feet becomes 10-foot intervals | UGA 1 | Only for a hedge you plan to shear |
| Screens | Space to mature size; two or three offset rows fill the gaps | Clemson 4 | Do not plant too close for a quick effect |
| Next to a house | Foliage at least 5 feet from walls for shrubs over 6 feet tall; at least 3 feet for shorter ones | Clemson 3 | Also leaves room for foundation vents |
| Perennials | Mature size, or size in the third year; extra room for plants that form colonies | UGA 2 | Liatris is the example UGA gives |
| Ground covers | Most 6 inches to 2 feet apart; closer fills faster but costs more | UNH 8 | Spacing follows growth rate |
Touching at maturity is not the same as crowded
UF/IFAS asks for plants that touch at maturity, which makes a continuous mass 6. UGA warns about plants that compete for light and air inside the canopy 1.
The difference is whether the plants can still reach light and move air once they fill in. A sheared hedge is the one case where UGA and Clemson accept overlap.
Example: how many plants a 40-foot run takes
The 40-foot run is invented. The spacing rules come from UGA 1. The plant count is simple arithmetic: gaps equal run length divided by spacing, and plants equal gaps plus one. A real job also sets the end plants back from a fence or property line.
| Case (example) | Spacing used | Gaps in 40 feet | Plants |
|---|---|---|---|
| Dwarf yaupon holly, 8 feet wide at maturity | 8 feet (UGA’s example) | 5 | 6 |
| Hedge plant, 12 feet wide at maturity, to be sheared | 10 feet (12 minus 2, UGA’s rule) | 4 | 5 |
| Same hedge plant set 6 feet apart to fill fast (illustration of overplanting, not advice) | 6 feet | 6.7, round up to 7 | 8 |
Plants = (Run length ÷ Spacing) + 1
Run length- Length of the planting line, in feet
Spacing- On-center distance in feet, from the plant tag, an extension source or the hedge rule
+ 1- Counts the plant at the start of the line
Round the gaps up, then add one. Plant ends are usually set back from fences and property lines.
Setting the 12-foot plant at 6 feet takes 8 plants instead of 5 and puts each plant half as far from its neighbor as UGA suggests.
Clemson calls overplanting probably the most common failure of foundation plantings and suggests fewer plants of more mature size over many small young shrubs 3.
Ask a bid to state the plant count and the spacing, as described on our landscaping estimates guide.
Where spacing shows up: tags, bids, plans and warranties
Plant tags. UGA says tags usually list mature height and width but advises double-checking a horticultural reference or the web 1.
Clemson’s mixed-screens page shows mature sizes in tables, from a tall arborvitae at 50 feet by 12 feet to a narrow one at 10 to 15 feet by 3 to 4 feet 4.
Planting plans. Designers draw circles at mature width. UF/IFAS suggests staging plants in their pots before planting to check the composition 6.
Bids. A bid should list each plant, its size at planting and the count. Compare lines using our guide.
Warranties. A plant warranty may not cover crowding that the owner later causes by adding plants. Read plant warranties before you add to a bed.
What good spacing does, and what it cannot do
What it does
- Keeps air moving through plants, which lowers disease pressure 4.
- Reduces pruning to keep plants in bounds, since each plant has room 3.
- Lets perennials bloom well. Colorado State says overcrowded perennials bloom poorly 7.
- Cuts the number of plants you must buy and replace, by using fewer, larger plants 3.
What it cannot do
- Cannot make a young bed look finished. A properly spaced bed looks sparse at first, and UGA notes the gap can mean more mulch for weeds 2.
- Cannot fix poor soil, shade or watering mistakes. See sun exposure and soil testing.
- Cannot stop a plant from spreading. Plants that form colonies need extra room 2.
Limits and open points
No universal distance. Clemson’s foundation page gives no spacing numbers between plants 3, UF/IFAS gives none for shrubs or trees 6, and Clemson’s mixed-screens page gives no fixed distance 4. The numbers in this page are each source’s own and carry its scope.
Mature size is not fixed. UGA says the same species can vary widely by cultivar, and gives blue sage that can reach 5 feet tall and wide next to a salvia that stays at 2 feet 2. Growing conditions also change size, and we found no source that quantifies how much.
Sources differ on timing. UGA recommends renovating perennial beds every 3 years in Georgia 2. Colorado State says some perennials need division after three to five growing seasons 7.
Tree spacing is not covered here. For a tree’s root space, see critical root zone. Trees need separate planning, and Clemson says large trees belong farther from a house than small trees 3.
What drives the cost of getting spacing right or wrong
We do not print prices on a glossary page. These factors move a bid.
Plant count and size. The wider the spacing, the fewer plants. Clemson recommends fewer plants of more mature size over many small young shrubs 3. Larger plants cost more each but need fewer.
Mulch and weeding. Wide gaps need more mulch, as UGA notes 2. See the mulch calculator and mulch types.
Pruning and removal later. Crowded shrubs need thinning. UGA recommends thinning dense plants every three to five years 1. See shrub pruning.
Replacement. Plants lost to crowding or disease must be replaced. See the cost hub and the cost estimator.
No source we read gives a plant lifespan for every yard, so we give none.
How spacing gets done on a job
A planner follows these steps. Each comes from a source cited on this page. Call 811 before any digging.
- List the plants and look up each one’s mature height and width. UGA says tags often list them but should be checked against a reference 1.
- Choose the rule that fits the job: touching at maturity for a bed 6, on center for mass plantings 5, 2 feet less than mature width for a sheared hedge 1.
- Check distances to walls and paving. Clemson sets at least 5 feet from walls for shrubs over 6 feet tall and 3 feet for shorter ones 3.
- Stage the plants in their pots, step back and adjust before planting 6.
- Stagger rows for screens. Clemson describes two or three offset rows that fill in the gaps 4.
- Plant, then water and mulch. For details on moving plants, see transplanting landscape plants.
Care as the bed fills in
Thin dense shrubs every few years. UGA says thinning every three to five years keeps interior growth healthy 1.
Divide perennials when they crowd. Colorado State says to divide spring and early-summer bloomers like creeping phlox or coreopsis in the fall, and mid-to-late summer or fall bloomers such as daylily or yarrow in the spring 7.
UGA gives a rule of thumb that is similar: divide spring-flowering perennials in the fall and fall-flowering perennials in the spring 2.
Watch for new problems at the house. Clemson ties the 3-foot and 5-foot clearances to air circulation for foundation vents and to mildew control 3.
Fill early gaps with a mulch layer until plants meet, as UGA’s perennial guide suggests mulch to control weeds 2.
Warning signs of crowding
Dead interior growth. UGA says interior foliage dies and dense inner growth can become a haven for spider mites and twig blight diseases 1.
Poor bloom and mildew. Overcrowded perennials bloom poorly, and humid, crowded beds invite powdery mildew 7.
Plants pressing on walls and windows. Clemson warns against tall plants that will eventually cover windows 3.
This page is not a diagnosis. For a declining shrub or tree, ask your Cooperative Extension office. To hire help, read how to choose a landscaping company.
Call 811 before digging, and keep trees away from lines
Call 811 before digging planting holes so buried lines are marked. When you choose a spot for a tall tree or large shrub, read its mature height first and keep it clear of overhead power lines. Do not prune near a line yourself; that is a job for a qualified arborist.
What is advice, and what is a rule
| Topic | What is stated | Type | Source |
|---|---|---|---|
| Distances between landscape plants | Guidance, based on mature size | Extension advice | UGA, Clemson, UF/IFAS 136 |
| Hedge height, sight lines and setbacks | Set by city or county ordinance | Local law | Check locally |
| Plant clearance around buildings in fire areas | Set locally or by state rule | Local or state rule | See the wildfire clearance research |
| Association limits on plant height or placement | Set by an HOA or covenant | Private rule | See HOA landscaping research |
Plant spacing compared with related ideas
| Idea | The difference | Where to read more |
|---|---|---|
| Plant spacing (this page) | Distance between plants, from mature size | You are here |
| Plant density | How many plants per area; ground covers are planned this way | Ground cover planning |
| Hardiness zone | Winter cold; says nothing about size or distance | Plant hardiness zone |
| Native planting | Chooses plants by local adaptation, and still needs spacing | Native landscaping |
| Bed preparation | Work done on the soil before plants go in | Landscape bed preparation |
Myths about spacing
- Myth Pack plants close so the bed looks full now.
- Reality Clemson warns against installing plants too close together to quickly achieve an effect, and calls overplanting the most common foundation failure 43.
- Myth The tag is always right.
- Reality UGA found a misprinted hybrid tag listing 12 to 15 inches for plants that grow 12 to 15 feet, and says to double-check 1.
- Myth One spacing fits all perennials.
- Reality UGA says to pay attention to species and cultivars, because blue sage can reach 5 feet while a salvia stays at 2 feet 2.
- Myth Wider is always safer for plant health.
- Reality UGA notes that planting too far apart means more mulch for weed control 2.
- Myth Hedges must never overlap.
- Reality UGA says to subtract about 2 feet from mature width so a sheared hedge’s canopies overlap slightly 1.
What changes by region: climate and growing conditions
Mature size depends on the plant and, in practice, on your climate and care. Our sources are regional: UGA and Clemson write for Georgia and South Carolina, and Colorado State writes for Colorado.
UGA recommends renovating perennial beds every 3 years in Georgia 2, while Colorado State says division may be necessary after three to five growing seasons 7.
That is a regional difference in one rule. Use the zone map to rule out plants for cold, and ask your local Cooperative Extension office for mature sizes in your area.
When spacing matters most, and your next step
Spacing matters most for shrubs and hedges that will grow for years, for plants near a house, and for beds you want to leave alone. It matters less for annuals and for ground covers where you accept close planting.
Your next step is to look up each plant’s mature height and width in two places, choose the rule from the table, and set the pots out before digging.
If you hire a company, ask for the plant count and spacing in writing. Find a landscaping company when you are ready. HyreYard does not plant or sell anything.
Questions about Plant Spacing
How far apart should I plant shrubs?
Use the shrub’s mature width. UGA says a dwarf yaupon holly that grows about 8 feet wide should be spaced 8 feet apart. For a hedge you plan to shear, subtract about 2 feet from mature width. Read the tag, then check a second source, because tags can be wrong.
What does on center mean in planting?
On center means measuring from the middle of one plant to the middle of the next. Clemson Extension says plants should be planted on center to allow for mature spread. It is the standard way to lay out a bed, so the gap between leaves shrinks as plants grow.
Why do my plants look too far apart when I plant them?
Plants are small when planted. UF/IFAS says to space them so they touch at mature size, not at planting size. A new bed looks sparse for a few seasons. UGA notes that wide gaps need more mulch to hold weeds back until plants fill in.
What happens if plants are too close together?
They compete for space, light, water and nutrients. UGA says interior foliage dies, air circulation drops, and plants become stressed and more prone to insects and disease. Dense inner growth can shelter spider mites and twig blight. Thinning every three to five years can help.
How far from the house should shrubs be planted?
Clemson says shrubs over 6 feet tall at maturity should have their foliage at least 5 feet from walls, and shorter shrubs at least 3 feet. The room helps air circulation around foundation vents and helps prevent mildew. Large trees belong farther away than small trees.
How do I space perennials?
UGA says to space perennials by mature size or by the size they reach in the third year. Species and cultivars differ, and plants that form colonies need extra room. Colorado State says overcrowded perennials bloom poorly and that some need dividing after three to five growing seasons.
How far apart should ground covers be planted?
University of New Hampshire Extension says most ground covers are spaced between six inches and two feet apart. Closer spacing fills in faster but costs more. Clemson says to space them so the bed is covered by the end of the third growing season. Faster growers need more room.
Should I plant in rows or a staggered pattern?
Clemson describes a staggered technique with two or three offset rows for screens, which fills gaps between plants. Illinois Extension recommends a staggered or diamond pattern for ground covers. Clemson also suggests grouping plants irregularly in mass plantings, instead of straight rows.
Do plant tags give the right mature size?
Usually, but not always. UGA says tags typically list mature height and width and advises checking a horticultural reference. It found a misprinted tag for hollies that listed 12 to 15 inches instead of 12 to 15 feet. Cultivars of one species can also differ a lot.
Is there a formula for how many plants I need?
For a row, divide the run length by the spacing and add one plant. For ground cover beds, Illinois Extension prints a chart for 100 square feet, such as 100 plants at 12 inches and 400 at 6 inches. Real jobs adjust for ends and edges, so confirm the count with the bid.
Sources
- University of Georgia CAES, Proper landscape plant spacing saves time, money (Gary L. Wade, April 27, 2006), retrieved .
- University of Georgia Extension, Landscape Basics: Success with Herbaceous Perennials (Bulletin 1424, Pennisi and Dorn, reviewed May 19, 2022), retrieved .
- Clemson Cooperative Extension HGIC, Foundation Plantings (HGIC 1702), retrieved .
- Clemson Cooperative Extension HGIC, Mixed Screens (HGIC 1731, August 13, 2017), retrieved .
- Clemson Cooperative Extension HGIC, The Power of Mass Planting in Landscape Design (Jennifer Weaver, June 29, 2026), retrieved .
- UF/IFAS Extension, Landscape Design: Arranging Plants in the Landscape (ENH1188/EP449, Gail Hansen and Keighly Graves), retrieved .
- Colorado State University Extension, Perennial Gardening (reviewed August 2025), retrieved .
- University of New Hampshire Extension, Groundcovers for New Hampshire (fact sheet), retrieved .
- University of Illinois Extension, Ground Covers (landscaping section), retrieved .
Expert review
Written by the HyreYard Research Desk. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Every distance in this page is printed by the named source and carries its scope; nothing is generalized to all plants.
The UGA and Clemson pages are Southern sources and Colorado State is a Mountain West source, so regional differences are shown rather than averaged.
The Clemson foundation page is dated 1999 and the UF/IFAS page carries no publication date. The 40-foot-run example uses invented lengths and plain arithmetic, labelled as such. We give no distances for trees and no planting dates.
Suggest a correction. We fix errors and say what changed.