A bare border in spring can feel like a lost season when you are waiting for slow-growing shrubs to fill the gap. Fast growing ornamental grasses deliver measurable vertical height, textural contrast, and flower plumes within a single growing season, transforming empty space into a layered landscape before the first frost arrives.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. I spend my time comparing live plant specifications, studying nursery propagation data, and analyzing aggregated owner feedback to identify which grass varieties actually deliver on their growth claims.
This guide breaks down five proven varieties that combine rapid expansion with real ornamental impact, helping you choose the right fast growing ornamental grass for privacy screens, border edges, or dramatic late-season color.
How To Choose The Best Fast Growing Ornamental Grass
Not every grass labeled “fast growing” will reach its mature size in your climate. The right choice depends on your USDA hardiness zone, the amount of direct sunlight your planting area receives, and the specific use case — privacy hedge, border accent, or erosion control.
Match Mature Height to Your Space
Fast growing ornamental grasses range from 2-foot clumping varieties to 10-foot giants like Pampas Grass. A 4-foot grass works well as a mid-border filler, while anything over 6 feet can serve as a seasonal privacy screen. Check the expected plant height listed on the nursery spec — a grass that reaches 10 feet in zone 9 will struggle to hit 4 feet in zone 7.
Consider Spread Rate and Clumping Habit
Some fast growers spread aggressively through rhizomes and can overtake a bed within two seasons. Clumping varieties expand outward from the crown at a controlled pace, making them safer for mixed borders. Pink Muhly Grass and Purple Fountain Grass are well-behaved clumpers, while Common Soft Rush manages spread via seed and stays contained when planted near a pond edge or in a dedicated patch.
Check Bloom Period for Seasonal Impact
The visual payoff of ornamental grass comes from its flower plumes or seed heads. Some varieties bloom in mid-summer and carry color into fall, while others peak in late autumn. Pink Muhly Grass delivers a dramatic late-season cloud of pink, while Pampas Grass produces creamy white plumes from mid-summer through fall. If you want color from June until frost, a variety with a long bloom window like Purple Fountain Grass is the better pick.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Pink Muhly Grass (3 Pots) | Premium | Late-season color show | 4 ft height, 3 ft spread | Amazon |
| Pampas Grass (2.5 Quart) | Mid-Range | Tall privacy screen | 10 ft height, white plumes | Amazon |
| Purple Fountain Grass (#1 Container) | Mid-Range | Mounded border accent | 4 ft height, maroon leaves | Amazon |
| Common Soft Rush (#1 Container) | Mid-Range | Wet soil / pond edge | 3 ft height, upright stems | Amazon |
| 8 Rooted Lemongrass Stalks | Budget | Edible herb & mosquito barrier | 5-6 inch stalks, multiplies | Amazon |
In‑Depth Reviews
1. 3 Pink Muhly Grass in 2.5 Inch Containers
Daylily Nursery ships three individual pots of Pink Muhly Grass, each rooted and ready for immediate transplant. The grass forms a cascading fountain of fine foliage through spring and summer, then erupts in giant puffballs of cotton-candy pink blooms in late summer that can stop traffic. With a mature height of 4 feet and a spread of 3 feet, three pots can create a dense ribbon of color across a 9-foot border within two seasons.
The variety is classified as a native grass for zones 6-10 and tolerates full sun to partial shade without losing bloom intensity. It handles drought well once established, though moderate watering during the first growing season encourages faster root development. The airy plumes are so light they sway in a breeze, making this an excellent choice for a middle-of-the-border focal point that keeps the garden interesting into October.
Owner feedback highlights how quickly the clumps expand compared to slower ornamental grasses like Blue Fescue — many report the first pink haze appearing just 8 weeks after planting in warm soil. The pink blooms also double as excellent cut flowers for dried arrangements, holding their color for several months after harvest.
What works
- Creates a dramatic late-season pink cloud that stands out in any border
- Three pots provide instant coverage for a medium-sized bed
- Drought tolerant and low-maintenance after establishment
What doesn’t
- Shipping occurs only once for up to 5 items — combine orders wisely
- Not hardy below zone 6; winter protection needed in colder areas
2. Pampas Grass (2.5 Quart) Tall Ornamental Perennial with White Plumes
Plants by Mail ships this Pampas Grass as a 2.5 Quart potted plant, giving it a solid root system that transitions quickly into garden soil. The grass produces oversized arching foliage and creamy white feathery plumes from mid-summer through fall, reaching up to 10 feet tall at maturity. This makes it one of the fastest ways to create a seasonal privacy hedge along a property line or to mark a boundary with visual impact.
Pampas Grass thrives in full sun and is hardy in USDA zones 7 through 11. It requires moderate watering during the first growing season — about once every two weeks — then becomes fully drought tolerant once established. The foliage turns tan-bronze in winter, adding cold-season interest before you trim it back in late winter to encourage fresh spring growth.
Customer reports consistently mention the rapid vertical growth rate; many saw the first plumes topping 5 feet within 3 months of planting in warm zones. The grass is also deer resistant and disease resistant, making it a low-fuss option for large landscapes. Note that it cannot ship to California, Hawaii, or Alaska due to agricultural restrictions.
What works
- Reaches 10 feet tall for instant seasonal privacy screening
- Plumes last from mid-summer through fall with minimal care
- Drought tolerant and deer resistant once established
What doesn’t
- Not suitable for small gardens due to large mature size
- Cannot ship to CA, HI, or AK due to regulations
3. Perennial Farm Marketplace Pennisetum s. ‘Rubrum’ (Purple-Leaved Fountain) Grass
Perennial Farm Marketplace delivers this Purple Fountain Grass as a fully rooted #1 container plant, ready for immediate transplant into full sun. The striking maroon leaves retain their rich burgundy color from spring through frost, providing consistent textural contrast even before the flower heads appear. The 6-8 inch long maroon seed heads emerge in June and last until the first hard frost, creating a continuous fountain of color for up to 5 months.
This variety reaches about 4 feet tall with a mounded habit, making it ideal for mid-border placement or mass planting in a bed. It is hardy in zones 8-10 and performs as a tender perennial in colder zones — many gardeners treat it as an annual in zone 7 and below, replanting each spring for reliable seasonal impact. Space plants 24-30 inches apart to allow the mounded form to develop fully.
Owner reviews consistently praise the uniformity of the maroon color across the entire growing season, noting that it pairs beautifully with silver-leaved plants like Artemesia or yellow-flowered perennials. The plant is also highly deer resistant, a practical advantage for rural or woodland-edge gardens where browsing pressure is high.
What works
- Maroon foliage and seed heads hold color from June until frost
- Compact 4-foot mounded habit fits well in mixed borders
- Highly deer resistant for exposed garden locations
What doesn’t
- Not hardy below zone 8; may need annual replanting in colder zones
- Cannot ship to several western states due to restrictions
4. Perennial Farm Marketplace Juncus effusus (Common Soft Rush) Ornamental Grass
Perennial Farm Marketplace offers Common Soft Rush as a rooted #1 container plant that thrives in conditions most ornamental grasses cannot tolerate — standing water up to 6 inches deep and heavy clay soils. The rounded vertical stems reach about 3 feet tall and maintain a rich green color throughout the growing season, fanning outward from the crown without aggressive spreading. It is a native wetland species that fits naturally at pond edges, rain gardens, or low-lying drainage areas.
Hardy from USDA zone 2 through zone 9, this is one of the most cold-tolerant fast growing grasses available. It performs best in full sun to part shade and requires moderate moisture — it will not sulk if you overwater it the way many other grasses would. Space plants 18 inches apart for a dense stand of upright green stems that soften hard lines around water features.
Owner feedback highlights its surprising visual texture: the round, leafless stems catch light differently than traditional grass blades, creating a sculptural effect in the landscape. It is also listed as deer-leerious (highly deer resistant), making it a reliable choice for properties with frequent deer visits. Note that it cannot ship to several western states including CA, OR, and WA.
What works
- Thrives in wet soil or standing water up to 6 inches deep
- Hardy down to zone 2 — extreme cold tolerance
- Upright, fanning form adds unique vertical texture
What doesn’t
- Topping out at 3 feet, it is short for privacy screening
- Cannot ship to AK, AZ, CA, CO, ID, MT, NV, OR, UT, WA, HI
5. 8 Rooted Lemongrass Stalks 5-6 inches Long Ready to Plant
This package contains 8 rooted lemongrass stalks, each 5-6 inches long, grown using an advanced hydroponic system that ensures clean, disease-free roots. Lemongrass is one of the fastest growing edible grasses available — each stalk multiples into a substantial clump within a single season, producing fresh stalks for tea and Asian cuisine while releasing citronella oils that naturally repel mosquitoes. It serves double duty as a productive herb and a functional insect barrier.
The grass prefers partial sun and moderate watering, making it suitable for patio containers, raised beds, or ground-level planting around walkways and decks. Spacing can be adjusted based on your aesthetic preference — tighter spacing produces a denser hedge effect, while wider spacing allows each stalk to form a larger individual clump. It is also classified as a natural mosquito barrier, though effectiveness varies with planting density and wind conditions.
Customer feedback commonly notes how quickly the stalks root and multiply after transplanting — many report visible new growth within 10 days of planting in warm soil. The packaging is designed to protect the delicate roots during shipping, and included tips help strengthen roots if any appear stressed upon arrival. This is an entry-level option that delivers both visual density and practical harvest value.
What works
- Rooted stalks establish fast and multiply within one season
- Doubles as an edible culinary herb and natural mosquito repellent
- Hydroponic growing method ensures clean, disease-free plants
What doesn’t
- Not frost hardy — must be overwintered indoors in cold climates
- Citronella repellent effect is mild compared to synthetic sprays
Hardware & Specs Guide
Mature Height and Spread
The final size of a fast growing ornamental grass directly impacts placement and spacing. A 4-foot grass like Pink Muhly or Purple Fountain works well in mid-border, while Pampas Grass at 10 feet needs a background position. Always check the expected height in your specific USDA zone — cold zones may produce shorter growth than the nursery spec suggests.
USDA Hardiness Zone Range
Each grass variety has a stated zone range that defines where it survives winter. Common Soft Rush handles zone 2, making it the most cold-tolerant option here, while Lemongrass has no zone tolerance and must be treated as an annual or overwintered indoors in freezing climates. Planting outside the recommended zone typically results in winter kill or significantly reduced vigor.
FAQ
How fast do fast growing ornamental grasses actually grow in one season?
Can fast growing ornamental grasses survive winter in containers?
Final Thoughts: The Verdict
For most gardeners, the fast growing ornamental grass winner is the Pink Muhly Grass from Daylily Nursery because it combines rapid growth, a dramatic late-season color show, and reliable clumping habit that won’t overtake a border. If you need a tall privacy screen with white plumes, grab the Pampas Grass. And for wet soil conditions or pond edges, nothing beats the Common Soft Rush.