Product Description
Free Plant Spacing Calculator for Perennial Gardens
Planning a new garden bed, groundcover planting, border, or mass planting? Use Bloomin Designs Nursery’s free plant spacing calculator to estimate how many perennials you need before you buy.
- Estimate plant count before ordering
- Plan bulk flats, plugs, and bare root plants
- Compare grid, staggered, and row layouts
- Shop with more confidence
Plant Spacing Calculator
Fill in the blanks below. Your result will estimate the number of plants needed and suggest how many packs or flats to order.
What would you like to plant?
Once you know the estimated plant count, choose the project that best matches your garden. These shortcuts help turn your calculation into a useful shopping path.
How to use your result
Use mature plant size, not shipping size
Many Bloomin Designs plants ship as plugs, starter plants, bare root plants, flats, or young potted plants. Spacing should be based on how wide the plant will grow at maturity, not how large it looks when it arrives.
Closer spacing fills faster
If you want the bed to look full sooner, choose closer spacing or order a few extra plants. This is especially helpful for groundcovers and front-yard plantings.
Wider spacing costs less
If you are working with a larger area or a tighter budget, wider spacing may be a better choice. The garden may simply take longer to fill in.
Spacing tips
Staggered planting looks more natural
A staggered layout helps avoid a stiff checkerboard look. It is often a good choice for groundcovers, ornamental grasses, and larger perennial drifts.
Leave room at the edges
A simple rule is to place the first plant about half the spacing distance from the edge. If plants are spaced 18 inches apart, place the first plant about 9 inches from the bed edge.
Quick examples
Shade groundcover bed
Bed size: 5 ft x 20 ft
Area: 100 sq. ft.
Spacing: 12 inches
Grid estimate: about 100 plants
Sunny ornamental grass drift
Bed size: 8 ft x 15 ft
Area: 120 sq. ft.
Spacing: 24 inches
Staggered estimate: about 35 plants
Walkway border
Border length: 30 ft
Spacing: 18 inches
Single-row estimate: about 20 plants
Before you choose plants
Plant count is only the first step. For the best results, also check:
- Your USDA hardiness zone
- Sun exposure: full sun, part sun, part shade, or shade
- Soil moisture: dry, average, moist, or wet
- Mature height and spread
- Deer pressure in your neighborhood
- Whether the plant spreads, clumps, or stays compact
- How quickly you want the area to fill in
The right plant in the right place saves time, money, and frustration.
Why plan with Bloomin Designs Nursery?
Bloomin Designs Nursery helps home gardeners plan practical perennial plantings, from small shade beds to larger bulk planting projects.
- Bulk perennial options for real garden projects
- Grower-shipped plants delivered to your door
- Free shipping on many plant listings
- Ship-week selection when available
- Practical planting guidance before and after purchase
- Arrive Alive Guarantee
Plant Spacing FAQ
What does “on-center spacing” mean?
On-center spacing means measuring from the center of one plant to the center of the next plant.
How do I know what spacing number to enter?
Use the recommended spacing listed on the plant product page. If the mature spread is listed as 18-24 inches, use the smaller number for faster fill and the larger number for a more budget-friendly planting.
Should I order extra plants?
For most larger beds, yes. Ordering 5-10% extra helps with curved edges, layout adjustments, corners, and future fill-ins.
Are the plants full size when they arrive?
No. Many perennials ship as starter plants, plugs, bare root plants, flats, or young potted plants. They are spaced by mature size, not arrival size.
Is staggered spacing better than grid spacing?
Staggered spacing usually looks more natural and can create better coverage. Grid spacing is easier to measure and works well for formal rows.
Can this calculator guarantee the exact number of plants I need?
No calculator can account for every curve, root, rock, slope, or personal design choice. Use the result as a strong planning estimate, then adjust for your bed shape and desired fullness.
Ready to plan your planting?
Use the calculator, choose the right plant category, and order with more confidence. Bloomin Designs is here to help you turn plant spacing into a practical garden plan.
