Big Blue Lilyturf vs Liriope Spicata: Which Should You Plant?

Most people grab whichever lilyturf is on the nearest bench, plant it along a bed edge, and find out three summers later that it has crossed the mulch line and is heading for the lawn. That is the common slip with this pair. Big Blue and Liriope spicata share the same grass-like leaves and the same purple spikes, so the tags read alike, but one stays put and one runs.

Picking wrong costs you years of digging. Picking right gives you a tidy evergreen clump that asks almost nothing of you. Read on for how the two compare from planting day through the first three years, including hardiness, sun and soil, the invasive question, and our straight answer on which one to buy.

Big Blue Lilyturf vs Spicata on Planting Day: Clumping vs Spreading

The fundamental distinction between these two plants comes down to growth habit. Big Blue Lilyturf is clump-forming. It spreads slowly via short rhizomes, expanding a few inches each year. After 2 to 3 years, you will have a fuller clump, but it stays largely in place. This predictability makes it ideal for borders, edging, and mixed plantings where you want precise control. Gardeners often mistake it for finer-leaved mondo grass, which grows differently.

Liriope spicata is the aggressive counterpart. It spreads rapidly through longer rhizomes, sending up new shoots across wide areas. This fast expansion is why it earned the name "creeping lilyturf." In many regions, spicata has naturalized in disturbed landscapes and is classified as weedy or invasive. Once spicata establishes itself, controlling it requires sustained effort, often involving repeated digging, mowing, or chemical treatment.

One of the most common questions we get is why a lilyturf border has jumped into the lawn. Nearly every time, the plant was spicata.

For the big blue lilyturf vs liriope spicata decision, this growth-habit difference is usually the deciding factor. Control versus chaos. Predictability versus unpredictability.

Key Attributes Comparison

This table lines the two plants up on the traits that matter most once they are in the ground.

Attribute	Big Blue Lilyturf	Liriope Spicata
Botanical Name	Liriope muscari 'Big Blue'	Liriope spicata
Growth Habit	Clump-forming	Aggressive spreading
Annual Spread	A few inches per year	Spreads rapidly and widely
USDA Zones	5-10	Check your local invasive list
Winter Behavior	Evergreen (zones 7-10), may brown in zones 5-6	Varies by region
Mature Clump Size	12-18 in. height and width	Spreads indefinitely
Spacing for Borders	12-18 in. apart	Wider spacing, rapid fill-in
Invasive Status	Not invasive	Weedy/invasive in southeastern US
Maintenance Needs	Minimal, no containment required	High, frequent division or barriers needed
Lifespan	Long-lived perennial (10+ years)	Indefinite if kept contained

Year One: Hardiness, Sun and Soil for Big Blue

Both plants have similar basic needs, so the first season looks much the same for either. Big Blue Lilyturf thrives in USDA zones 5 through 10. In zones 7 through 10, it remains evergreen year-round. In zones 5 and 6, expect the foliage to die back or brown over winter, this is normal and not a sign of damage. The plant will return in spring.

Liriope spicata has similar hardiness across much of its range, though you should check your state or regional invasive plant list before planting it. This is especially important in the southeastern United States, where spicata has become a serious landscape pest.

Both species tolerate full sun to full shade. We grow Big Blue in part shade for the darkest, densest foliage, though it flowers most freely in more sun. Both accept average, well-drained soil and tolerate clay, but neither likes wet feet. Water needs are low to moderate, and once established (roughly one growing season), both handle dry spells. Neither needs much fertilizer. Both do well in lean soil with a light spring application of balanced fertilizer.

Plant in spring, water through that first season, and then leave it alone. Our planting guide covers the details. Each late winter, trim off tired leaves before spring growth begins, as shown in our guide to cutting back Big Blue.

So from a cultural standpoint, you could plant either in the same location and expect similar basic performance. The critical difference emerges in how they use that space over time.

Is Big Blue Lilyturf Invasive?

No. Big Blue Lilyturf is not considered invasive anywhere. Because it spreads slowly via short rhizomes and maintains a clump structure, it poses no ecological threat. You can plant it safely near forest edges, wetland areas, or conservation lands without concern that it will escape and disrupt native plant communities.

Liriope spicata is a different story. In the southeastern United States, spicata has become a genuine ecological problem. It has naturalized in disturbed areas, forests, and roadside embankments. Once established, it crowds out native groundcovers and wildflowers, and it is nearly impossible to eradicate.

If you live in a region where spicata is listed as an invasive or weedy species, avoid it entirely, especially if your property adjoins natural areas or public land.

This difference alone answers the question: is big blue lilyturf invasive like spicata? Absolutely not.

Years two and three are where the habit shows. Your Big Blue fills out into a full clump and settles at a mature 12 to 18 inches tall and wide. Space plants 12 to 18 inches apart for a border, as our spacing guide explains, and expect a solid edge by year three.

Big Blue at Maturity: Pros and Cons Side by Side

By year three you know what you have. In autumn, Big Blue sends up violet-purple flower spikes above dense, dark green leaves. Here is how the two plants stack up once they are settled in.

Pros of Big Blue Lilyturf

• Reliable, predictable growth pattern that stays under control
• Excellent for borders, edging, and formal plantings
• Minimal ongoing maintenance, with no need for containment strategies
• Not invasive, so it is safe to plant near natural areas or sensitive landscapes
• Long-lived perennial that commonly persists 10 or more years
• Deer-resistant and tolerates typical garden pests well
• Adaptable to a wide range of sun and soil conditions
• Remains evergreen in milder zones for year-round interest
• Establishes in roughly one growing season

Cons of Big Blue Lilyturf

• Slower to fill in large areas compared to creeping lilyturf
• Takes 2 to 3 years to reach mature clump size (12-18 in. width)
• Foliage may brown or die back in harsh winters in zones 5-6
• Not ideal if you need fast groundcover coverage

Pros of Liriope Spicata

• Rapid coverage for large areas (in regions where it is not regulated as invasive)
• Spreads aggressively, so fewer initial plants are needed
• Equally adaptable to sun, shade, and soil conditions
• Same hardiness and drought tolerance as Big Blue

Cons of Liriope Spicata

• Classified as invasive or weedy in the southeastern United States
• Extremely difficult to control or eradicate once established
• Will escape designated planting areas and spread into surrounding landscapes
• Requires frequent division, barrier systems, or chemical suppression
• May crowd out or choke neighboring plants
• Poor choice if your property borders natural areas, forests, or wetlands
• Creates ecological risk in vulnerable regions
• Can naturalize beyond your property line

Which to Plant: We Pick Big Blue Lilyturf

When to Choose Big Blue Lilyturf

Plant Big Blue Lilyturf if you want to edge a pathway, line a perennial border, or create a tidy, controlled groundcover under trees. Choose it if you live in zones 5 or 6 and want a plant that will remain reliably hardy through winter. Plant it if you value predictability and low maintenance over rapid fill-in.

Use Big Blue if your property adjoins natural areas or if you want a landscape that will not escape its intended boundaries. Select it if you want to establish a long-lived perennial that improves and becomes fuller over time.

For residential yards, Big Blue Lilyturf is the clumping liriope we recommend, and it is the one we grow. Other clumping cultivars such as Royal Purple are worth a look, but we still prefer Big Blue.

One piece of common advice we don't follow is to plant spicata for fast cover and just keep it edged. Edging has to be redone every year, and runners get past it. We would rather you wait three years for a clump that stays where you put it.

When to Consider Liriope Spicata

Consider Liriope spicata only if all of these conditions are true: you live in a region where spicata is NOT listed as invasive or weedy, you need aggressive groundcover for a defined, contained area, you are willing to manage and divide it regularly, your property does not border natural areas or sensitive landscapes, and you can install physical or chemical containment barriers.

Even then, most home gardeners find the management burden not worth the faster initial coverage.

The Practical Verdict

If you are trying to decide between liriope muscari vs liriope spicata, choose Big Blue Lilyturf unless you have a very specific reason to choose otherwise. Big Blue offers control, predictability, and peace of mind. It plays well in mixed borders, serves as reliable edging, and stays within bounds. Liriope spicata offers speed at the cost of ongoing management and ecological risk.

The difference between Big Blue and creeping lilyturf ultimately comes down to this: one lets you relax, and one demands vigilance. Most of our customers choose to relax.

To learn more about planting and maintaining Big Blue Lilyturf, see our full Big Blue Lilyturf care guide for detailed instructions on spacing, pruning, and seasonal care.

Quick Reference: Which Lilyturf Should You Plant?

If you want the whole comparison in one place, this table answers the questions we hear most.

Question	Big Blue Lilyturf	Liriope Spicata
Spreads predictably in your zone?	Yes (a few inches per year)	No (rapid, uncontrolled)
Safe for wildlife areas or near natural landscape?	Yes (not invasive)	No (invasive in SE US)
Ideal for borders or edging?	Yes (excellent choice)	No (not recommended)
Low-maintenance once established?	Yes	No (requires management)
Hardy and reliable in zones 5-6?	Yes	Varies (check regional invasive list)
Stays within defined boundaries?	Yes (12-18 in. mature clumps)	No (spreads indefinitely)
Good for covering large areas quickly?	No (slow to moderate growth)	Yes (fast spread)
Better overall choice for home gardeners?	Yes	No (use only if absolutely necessary)

Big Blue Lilyturf: Plant It and Walk Away

Big Blue and spicata look alike on the bench but behave nothing alike in the ground. Big Blue forms a clump that fills in over two to three years and stays within bounds. Spicata gives faster cover, then asks for constant management. For nearly every home landscape, we would plant Big Blue and leave it alone.

Customers come back to us for Big Blue because it does what the tag promises, year after year. We are growers with our own farms, and we grow and sell top-quality plants, so we only offer the lilyturf we would plant in our own beds.