Big Blue Lilyturf Spacing for Borders, Edging and Mass Planting

Every spring we watch the same scene at the nursery. Customers load up on Big Blue Lilyturf, then ask how close is too close. Most want to squeeze the clumps together for instant coverage. We get it, but crowded clumps turn thin and straggly by year two, and wide gaps just invite weeds.

This guide covers everything you need to know about spacing Big Blue, from borders and tree rings to mass plantings and containers, plus the layout, planting and watering steps as the seasons turn. Get the spacing right and you plant it once. You get a dense, dark green edge that sends up violet-purple spikes every autumn and asks for almost nothing in return.

How Big Blue Lilyturf Grows

Spacing makes sense once you know how this plant fills in. Here is the habit we plan every layout around.

Big Blue Lilyturf (Liriope muscari 'Big Blue') is an evergreen clump-former with a medium growth rate. Each clump widens slowly rather than running, and it matures at 12 to 18 inches tall and wide. The violet-purple spikes show up in autumn and reach about 6 to 8 inches, so they sit at or below the top of the foliage instead of towering over it.

This growth habit is why spacing matters so much. Plant too close and you'll have a solid wall of lilyturf in just a year or two, but with weak, spindly growth as the clumps fight for resources. Plant at the right distance and you get healthy, full clumps that fill in gradually without wasted energy on competition.

You will hear advice to plant at 8 or 9 inches for a faster carpet. We don't follow it for Big Blue. The clumps are slow to bulk up, so the time you save is small and the crowding cost shows up in year two.

Spacing Big Blue Lilyturf for Borders, Edging and Mass Planting

The right distance depends on the job. Pick your use below, then decide how fast you want it filled.

Big Blue Lilyturf Spacing for Borders

For borders along walkways, driveways or flower beds, plant Big Blue Lilyturf 12 to 18 inches apart. What we tell customers is to choose 12 inches (one foot) when they want a quick, tight edge within one to two growing seasons. The clumps will be touching or nearly touching within 18 to 24 months, creating a solid, finished look.

If you have a long border and budget is tight, you can space at 18 inches to use fewer plants. The border will take an extra year or so to fill in completely, but you'll spend less upfront. The trade-off is visible gaps in year one and part of year two.

Big Blue Lilyturf for Edging Around Trees and Shrubs

Tree wells and shrub edging benefit from 12 to 15 inch spacing. The smaller spacing prevents adventurous lawn grass or weeds from creeping in while your lilyturf is still filling gaps. Once the clumps mature and touch, they form a living barrier that outcompetes weeds naturally.

Big Blue Lilyturf Mass Planting and Ground Cover

For larger mass plantings, 18 inches is the spacing we reach for (12 to 18 inches is the standard range). At 18 inches you use fewer plants per square foot, which lowers installation cost and cuts the planting workload. Full coverage takes about 2 to 3 years instead of 18 months, and on big areas we think the savings are worth the wait.

The key is knowing your site. Mass plantings under trees, in slopes or in shade gardens are ideal for the 18-inch spacing, since lilyturf thrives in shade and isn't rushed to fill in quickly. How far apart to plant liriope big blue in these situations depends on whether you need immediate fullness (choose 12 inches) or are willing to wait for a more gradual, natural effect (choose 18 inches).

Container and Mixed Plantings

Big Blue Lilyturf works as an edger in mixed containers and as a specimen in larger pots. For containers, plant lilyturf toward the edge 6 to 8 inches from the pot rim, spacing multiple clumps 8 to 10 inches apart in a large planter. One clump per container looks sparse at planting but fills a standard 12 to 18-inch pot nicely over one to two seasons.

Late Winter: Prune and Gather Your Gear

If you are adding to an existing bed, late winter is your first job. Big Blue is evergreen, so old leaves hang on and look rough by February.

Shear last year's tired foliage down before new growth starts. Prune before spring growth begins, or you will clip the new tips and leave ragged brown edges all summer. Our guide to cutting back Big Blue Lilyturf covers the height and timing. Then gather your tools.

Materials You Will Need

• Big Blue Lilyturf plants (quart, #1 or #3 containers from a nursery)
• A measuring tape or ruler
• A spade or sharp shovel
• Compost or aged bark (optional, for soil amendment)
• Water source (hose or watering can)
• Work gloves
• A marking tool (chalk, string or spray paint) for layout

Spring: Lay Out and Plant Big Blue Lilyturf

Plant once the ground is workable. Big Blue grows in USDA zones 5 through 10, and it takes anything from full sun to deep shade. It flowers most freely in a sunny spot, so choose sun if you want the best bloom. Drainage matters more than light, because soggy ground invites crown rot.

Steps for Spacing and Planting

Step 1: Measure and Mark Your Spacing Layout

Lay out your planting bed using a measuring tape. For a 12-inch spacing, mark every 12 inches along the border or mass planting area. Use chalk, stakes and string, or temporary spray paint to create a visual guide. Double-check your measurements before digging. It's much easier to adjust marks than to move planted lilyturf later.

Step 2: Prepare the Soil

Clear the area of weeds, grass and debris. You don't need to dig deep. Big Blue Lilyturf is adaptable to average, well-drained soil and tolerates clay. If your soil is heavy clay or compacted, loosen the top 6 to 8 inches with a spade and work in 2 to 3 inches of compost. This isn't required, but it speeds establishment and reduces the time to your first full growing season.

Step 3: Dig Planting Holes

Dig holes slightly wider and the same depth as the root ball of your lilyturf plant. For most nursery quart or #1 containers, holes are 6 to 8 inches wide and 4 to 6 inches deep. Space holes according to your marked layout.

Step 4: Position Each Plant

Remove the lilyturf from its container and gently loosen the root ball by hand or with a knife if roots are tightly wound. Plant at the same soil level as the container. Big Blue Lilyturf should not be buried deeper than it was growing in the pot, or the crown may rot.

Step 5: Backfill and Water Thoroughly

Fill holes with native soil, pressing gently to remove air pockets. Water each plant immediately after planting to settle soil and establish contact between roots and soil. Water the entire planting bed so soil is moist to a depth of 4 to 6 inches.

Step 6: Mulch (Optional but Helpful)

Spread 1 to 2 inches of aged bark or compost around each plant, leaving a 2-inch gap around the foliage crown to prevent rot. Mulch helps retain moisture during establishment and suppresses weeds as your lilyturf fills in.

Summer and Fall: Water, Wait and Watch It Bloom

Your only real job after planting is water. Big Blue is a low-fuss plant, but it needs steady moisture in its first season.

Spacing at 18 inches requires patience and consistent water for the first growing season. If you underwater to save effort, clumps struggle, and coverage takes much longer. Water newly planted lilyturf weekly in the first month, then adjust based on rainfall and soil moisture.

Our watering guide for new and established Big Blue has the full schedule. Once the roots are in, it needs only low to moderate water. Watch young growth for slug damage, which is the one pest we see on new plantings.

One of the most common questions we get in late summer is whether a sparse planting is failing. It almost never is. Wait for the autumn bloom before you judge the gaps, because the spikes make the planting look fuller, and the clumps keep widening every year.

Spacing Mistakes and What to Expect Year by Year

Most spacing problems come down to three habits. Here are the ones we see most, followed by a realistic timeline.

Mistake 1: Planting Too Close

It's tempting to reduce spacing from 12 inches to 8 or 9 inches to get instant coverage. Resist this. Overcrowded lilyturf clumps starve for water and nutrients, leading to weak growth, disease susceptibility and a thin, straggly appearance by year two. Stick to 12 to 18 inches.

Mistake 2: Uneven Spacing

Eyeballing distances leads to some clumps 10 inches apart and others 16 inches apart. This creates a patchy, disjointed look as some fill in while others lag. A measuring tape takes five extra minutes and makes all the difference.

Mistake 3: Forgetting Your Mature Width

Each clump spreads to 12 to 18 inches wide at maturity. If you space at 12 inches and don't account for that spread, two mature clumps can overlap and compete. If overlap is what you want (for a denser effect), that's fine. But make the choice intentionally, not by accident.

With 12-inch spacing, your border or mass planting should look substantially filled in within 18 to 24 months. Individual clumps are still separate in year one, but gaps narrow visibly by late summer of year two.

At 18-inch spacing, expect noticeable coverage by year two and full, touching clumps by year three. This timeline assumes average rainfall or weekly watering in the first season.

For more details on long-term care after spacing and planting, see the Big Blue Lilyturf care guide: sun, soil, water and more. Big Blue Lilyturf is deer resistant, so you don't need to worry about wildlife pressure affecting your spacing plan or final appearance.

Quick Reference: Spacing by Landscape Use

Use this table to match your planting to a spacing, a plant count and a fill-in timeline.

Landscape Use	Spacing	Plants per 10 ft	Fill-in Timeline	Best For
Tight border	12 in.	10 plants	18-24 months	Walkways, defined edges
Loose border	15 in.	8 plants	24-30 months	Budget-conscious borders
Mass planting	18 in.	6-7 plants	24-36 months	Slopes, shade, larger areas
Under trees	12-15 in.	8-10 plants	18-24 months	Weed suppression
Containers	8-10 in.	2-3 per pot	12-18 months	Mixed plantings

Space It Once and Let Big Blue Do the Rest

Measure, mark and plant at 12 inches for a fast, tight edge or 18 inches for big areas. Water the first season, then step back. Big Blue fills in by itself, and it rewards patience with a dense evergreen mat and autumn spikes.

Every Big Blue we ship is grown on our own farms, potted with a full root system and packed so the foliage and crowns arrive ready to plant. We grow and sell top-quality plants, and we want your spacing plan to work from day one.