Southern Wax Myrtle Spacing (Hedge Guide)
For a maintained, dense Southern wax myrtle hedge, start with plants 3–4 feet apart, measured center to center. For a looser, more natural screen, start at 5–6 feet. These are planning ranges, not guarantees: check the mature width of your chosen cultivar, site conditions, and local guidance before setting the line.
A hedge can look sparse for years if plants are spaced too far apart. Set them too close, though, and they may compete for light, water, and room as they grow. The right spacing depends on the look you want, how much pruning you can maintain, and how large the selected Southern wax myrtle is likely to become.
I plan spacing from the plants’ eventual size, not the small pots at the nursery. The measurements below are useful starting points. Cultivars and growing conditions differ, so confirm the plant label and allow for its mature spread.
Choose spacing for the hedge you want
Spacing is the distance from the center of one plant to the center of the next. For Southern wax myrtle (Morella cerifera, also sold as Myrica cerifera), 3–4 feet on center is a starting range for a closely maintained hedge; 5–6 feet suits a more open screen. Neither range guarantees when the plants will meet.
Dense hedge or natural screen?
A clipped hedge is kept within a defined shape, which means it needs regular attention. Closer spacing can help create a continuous line sooner, but it also leaves less room for each plant as it matures. A natural screen is allowed more space and a looser outline, so the wider range is often a better fit.
| Intended result | Starting spacing | What to expect |
|---|---|---|
| Dense, regularly maintained hedge | 3–4 ft on center | Plants are closer together; plan for ongoing shaping and adequate light |
| Looser, natural screen | 5–6 ft on center | More open gaps while plants grow; less formal appearance |
| Cultivar with a broad mature spread | Recheck before planting | Wider spacing may be needed to reduce crowding |
| Tight site or limited maintenance time | Recheck the plan | A large shrub may not suit the space or upkeep available |
These are starting ranges, not fixed rules. Look up the cultivar’s mature width, and ask a local nursery or Extension office how it performs in your area. If the label does not give a reliable width, do not assume that a narrow nursery plant will stay narrow.
Measure and prepare the planting line
A planting line is the route your hedge will follow, with each plant marked at its center point. Good layout makes the spacing consistent and helps you spot conflicts before digging. Check the space above and around the line, soil drainage, underground utilities, property boundaries, and nearby paths or driveways.
Set centers, not root-ball edges
Use a tape measure, stakes, and line to mark the hedge route. Measure between the marks where the plant stems will sit, not between the edges of the pots or root balls. For a straight hedge, a taut line helps keep centers in line; for a curved hedge, mark the curve before setting each center.
Before digging, contact the local utility-marking service. Also check property-line setbacks and any rules that apply to your site. Leave room for mature branches so the hedge will not block sightlines, cover access, or press against buildings and fences.
Check the planting spot
Southern wax myrtle can grow into a large shrub or small tree, and mature size varies by cultivar and site. Make sure the chosen location offers enough rooting room and overhead clearance. Check drainage, too: persistently saturated soil can lead to root problems, and extra watering will not fix poor drainage.
Plant each shrub at the right depth
Planting depth affects root health. The root flare is the point where the trunk widens into the main roots; it should sit at or slightly above finished soil grade. A wide planting hole gives roots room to spread, while planting too deep or into saturated soil can contribute to decline.
A step-by-step planting method
- Dig a hole about two to three times as wide as the root ball, but no deeper than the root ball.
- Look for circling roots and loosen them gently so they can grow outward.
- Set the plant so the root flare is at or slightly above the surrounding finished grade.
- Backfill with the soil you removed, then water thoroughly to settle it around the roots.
- Spread 2–3 inches of mulch over the root area, keeping it clear of the stems.
Do not bury the root flare to make the row look level. If the ground stays wet after rain, address drainage or choose a better location rather than adding more irrigation. Keep the soil evenly moist while plants establish, adjusting water for rainfall, heat, soil, and drainage.
Plan for mature width, not fast closure
Mature width is the spread a plant may reach when grown, and it can differ from one cultivar or site to another. Spacing should balance the desired visual closure with room for growth. A row that closes quickly may also need more pruning and can become crowded if the plants outgrow the available space.
Two layout scenarios
These examples show how to apply the spacing ranges; they are planning calculations, not claims about how quickly a hedge will fill in.
- A 24-foot formal hedge: At 3-foot centers, eight spaces span 24 feet. The number of plants depends on whether you want a plant at each end. Mark the end centers first, then measure the remaining intervals.
- A 30-foot natural screen: At 5-foot centers, six spaces span 30 feet. As above, decide whether the layout includes a plant at both ends before buying plants.
In my work, one common planning mistake is choosing spacing from the number of pots that fit in a car or from the width of young plants. Instead, mark the full line and compare the distance between centers with the mature width on the plant label. If the expected spread is large for the site, change the layout or select a more suitable cultivar before planting.
Avoid forcing instant closure
Very tight spacing can increase competition for light and water, reduce airflow, and raise the amount of pruning needed. It does not guarantee a strong, even hedge. Choose the closer end of the recommended range only when routine maintenance and suitable light are available.
Shape the hedge without stripping its base
Shaping means guiding growth into the form you want after plants have had time to establish. For a clipped hedge, keep the base a little wider than the top so lower foliage can receive light. Remove dead or crossing branches selectively instead of cutting all growth into a flat surface.
Choose tools for the job
Hand pruners suit small corrective cuts. A hedge trimmer can shape light growth on an established hedge, but it is not the right tool for large branches. Keep blades clean and sharp, use eye protection, and follow the tool maker’s safety instructions.
Avoid repeated shearing into bare interior wood. Wax myrtle may not reliably refill areas that have been stripped of foliage, leaving lasting gaps. Do not top established plants to control height; if the space cannot accommodate the expected size, reassess the plant choice and layout.
Maintain spacing as plants grow
Spacing is set at planting, but the hedge’s shape changes over time. Inspect plants for crowding, drought stress, waterlogged soil, and dieback. Keep mulch around the root zone but away from stems, and water during dry establishment periods when the soil is dry.
Seasonal care and follow-up
There is no single watering schedule that fits every site. Check soil moisture and adjust for rainfall, heat, soil type, and drainage. Before a prolonged hot, dry period, water if the root zone is dry; do not keep already wet soil saturated.
Keep pruning tools clean, dry, and sharp, and follow the manufacturer’s storage and battery or fuel instructions. As the hedge fills in, check whether the lower branches still receive light. If plants are pressing into one another, review the spacing and prune selectively rather than cutting deep into bare wood.
Frequently asked questions
These quick answers cover the main spacing decisions for a Southern wax myrtle hedge. Use them as a starting point, then verify mature size for your cultivar and conditions. The goal is a layout that fits the site and the level of care you can provide.
How far apart should I plant Southern wax myrtles for a hedge?
Start with 3–4 feet on center for a dense, regularly maintained hedge. Check the cultivar’s expected mature width and local advice before planting, since growth and final size vary.
How far apart should I plant them for a natural screen?
Use 5–6 feet on center as a starting range for a looser screen. Wider spacing leaves more room between plants as they grow, but does not guarantee a particular fill-in time.
What does “on center” mean?
It means measuring from the center of one plant to the center of the next. Do not measure from the outside edges of the pots or root balls.
Can I plant them closer to make the hedge fill faster?
Closer spacing may reduce the initial gaps, but extremely tight planting can increase competition and pruning needs. Use the closer end of the 3–4-foot range only if the site and maintenance plan support it.
Should I space plants by their current size or mature width?
Plan around the cultivar’s mature width, not the size of the nursery plant. Check the plant label or ask a local nursery or Extension office if mature dimensions are unclear.
How deep should the planting hole be?
Dig no deeper than the root ball and about two to three times as wide. Set the root flare at or slightly above the finished soil grade.
How much mulch should I use?
Apply about 2–3 inches of mulch over the root area. Keep it away from stems, and check the depth as it settles or breaks down.
Can Southern wax myrtle grow in wet soil?
Persistently saturated soil can harm roots and contribute to decline. Check drainage before planting; extra irrigation is not a solution to soil that stays waterlogged.
When should I begin shaping the hedge?
Let plants establish before routine shaping. Then use selective pruning or light trimming to guide growth, keeping the base slightly wider than the top so lower foliage gets light.
Will bare spots refill if I shear into the interior?
Not reliably. Avoid repeatedly cutting into leafless interior wood, since severe stripping can leave sparse areas. If the plant has outgrown its space, reconsider the layout rather than topping it.
Before you plant, mark the centers, check mature width, and confirm drainage and clearance. Those steps matter more than aiming for a perfect-looking row on planting day.
(This article was written by one of our staff writers, Nathan Pierce. Visit our Meet the Team page.)
