10 Fast-Growing Perennials That Will Fill Your Garden In A Flash

Here are the fastest growing perennials for any garden.

These richly colored blanket flowers blooming in garden

Every garden needs both annuals for instant impact and perennials for color that returns for many years. Because perennials are long-lived, they’re a great investment in your garden.  Besides adding beauty, texture, and structure to your garden, perennials also provide food for beneficial insects and pollinators.

But you do need to be a wee bit patient with perennials, which can take their time getting established. In fact, there’s a saying among gardeners that perennials sleep, creep, leap. That means they tend to grow fairly slowly the first year while they’re setting down their roots, then they grow a little faster the second year. By the third growing season, they finally take off.

Tips for Choosing Perennials for Your Garden

When shopping, make sure to choose a variety that will survive winters in your USDA Hardiness zone (find yours here). Also, read the plant tag or description so you’ll know what kind of light it needs: Full sun is considered 6 or more hours of direct sunlight per day, while part sun is about half that.

Finally, remember that the tiny 3-inch pots are going to take far longer to fill in your garden than gallon-sized or larger. So, when possible, opt for the larger size for quicker results. And don’t forget to keep your plants watered during the first season so they can set down strong roots.

Ahead, our favorite low-maintenance fast growers that will fill in your garden in a flash:

01 of 10

Agastache

agastache plant in bloom

Getty Images / Catherine McQueen

  • Botanical Name: Agastache spp.
  • Sun Exposure: Full sun
  • Soil Type: Average, well-draining
  • Soil pH: 6 to 7.5

Also known as hummingbird mint, this upright, clumping perennial has pretty spikes of flowers in shades of red, pink, coral, yellow, white, purple or hot pink from summer to early fall. It’s a favorite of pollinators such as bees, butterflies, and hummingbirds and is heat and drought tolerant once established. As a member of the mint family, the scented foliage is not particularly appealing to rabbits and deer.

Varieties for the South: Royal Raspberry, Summerlong

02 of 10

Coreopsis

Bright yellow flowers with dark red centers bloom in summer garden

Getty Images / Grace Cary

  • Botanical Name: Coreopsis spp.
  • Sun Exposure: Full sun
  • Soil Type: Average to poor, well-draining
  • Soil pH: 6 to 7.5

This sturdy deer-resistant perennial has bright, cheery daisy-like flowers in various shades of gold and yellow or bicolor with red centers. It loves hot, dry conditions and blooms early to late summer, attracting butterflies and bees. Its common name of “tickseed” comes from the fact that the seeds resemble ticks (But don’t worry! They don’t attract them).

Varieties for the South: Uptick, Double the Sun, Golden Stardust

03 of 10

Catmint

Catmint growing in garden

Getty Images / Jacky Parker Photography

  • Botanical Name: Nepeta spp.
  • Sun Exposure: Full sun
  • Soil Type: Average to poor, well-draining
  • Soil pH: 5 to 8

Catmint is one of the least fussy perennials you can grow, readily adapting to different conditions and soil types. Its fuzzy, gray-green foliage is lightly scented, so it’s not particularly attractive to deer and rabbits. New types stay in a tidy mound, and the lavender, blue, or pink flowers last for weeks from spring to late summer, depending on the variety.

Varieties for the South: Jr. Walker, Whispurr

04 of 10

Salvia

White sage flowers in soft sunlight on a green, orange and white background in summertime.

Getty Images / By Eve Livesey

  • Botanical Name: Salvia spp.
  • Sun Exposure: Full sun to part shade
  • Soil Type: Average to poor, well-draining
  • Soil pH: 5.5 to 6.5

Salvia, also known as sage, has pretty purple, white, or pink flowers which attract pollinators. Hummingbirds especially love the tubular-shaped blooms. These deer-resistant perennials are an excellent low-maintenance addition to the garden for blooms from late spring to early fall, depending on the variety. Make sure to read the tag because there also are annual types.

Varieties for the South: Blue by You, Mirage

05 of 10

Kniphofia

Vibrant coloured summer flowers of Kniphofia 'Tawny King' red hot poker

Getty Images / Jacky Parker Photography

  • Botanical Name: Kniphofia
  • Sun Exposure: Full sun
  • Soil Type: Average, well-draining
  • Soil pH: 6 to 7.5

Also known as red hot poker, this fun perennial with spiky, exotic-looking flowers brings plenty of drama to the garden. The continuous blooms from summer to fall attract tons of pollinators, especially hummingbirds. Flowers are red, bicolor, orange, peach, or gold.

Varieties for the South: Backdraft, Solar Flare

06 of 10

Perennial Geranium

geranium

Southern Living/Adrienne Legault

  • Botanical Name: Geranium spp.
  • Sun Exposure: Full sun to part shade, especially in the afternoon
  • Soil Type: Average to poor, well-draining
  • Soil pH: 6 to 6.5

Perennial geraniums, also known as cranesbill geranium due to the shape of the flowers, are a type of hardy groundcover that spreads rapidly. The have butterfly-like blooms that float over the foliage from late spring to early summer; some types rebloom. Give them some afternoon shade in very hot areas. Deer and rabbits typically don’t like the spicy-scented foliage.

Varieties for the South: Biokovo, Boom Chocolatta

07 of 10

Daylily

Flowers of a daylily of brown-yellow on a bed in the summer. Hemerocallis fulva

Getty Images / Oksana Akhtanina

  • Botanical Name: Hemerocallis spp.
  • Sun Exposure: Full sun
  • Soil Type: Average to poor, well-draining
  • Soil pH: 6 to 6.5

Daylilies have big, bold blooms that appear for just one day, as you may have guessed. But each plant is loaded with blooms, so you’ll have weeks of gorgeous flowers. There are flowers in nearly every color of the rainbow. Daylilies bloom in early, mid and late summer, depending on the variety. But be aware that deer love these plants, so avoid planting them if Bambi is a frequent garden visitor.

Varieties for the South: Frankly Scarlet, Lavender Eyes

08 of 10

Gaura

Pink Gaura flowers in garden. Oenothera lindheimeri or Gaura lindheimeri

Getty Images / ANGHI

  • Botanical Name: Oenothera lindheimeri
  • Sun Exposure: Full sun to part shade, especially in the afternoon
  • Soil Type: Average to sandy, well-draining
  • Soil pH: 6 to 6.5

These airy blooms look like butterflies dancing in the breeze, which gives them their common name of butterfly flower. This perennial is drought tolerant and has a very long bloom time, flowering all summer long.

Varieties for the South: Whiskers Deep Rose

09 of 10

Lavender

Purple lavender bushes grow on a flower bed in the garden on a sunny summer day

Getty Images / Katya Slavashevich

  • Botanical Name: Lavendula spp.
  • Sun Exposure: Full sun
  • Soil Type: Average to sandy, well-draining
  • Soil pH: 6.7 to 7.3

Not all types of lavender love the South’s humidity, but if you choose the right lavender variety, you can enjoy the fragrant purple flowers and silvery foliage of this much-loved perennial. The gorgeous scent and scented foliage is also deer and rabbit resistant.

Varieties for the South: Sweet Romance, Phenomenal

10 of 10

Blanket Flower

These richly colored blanket flowers blooming in garden

Getty Images / Katrin Ray Shumakov

  • Botanical Name: Gaillardia spp.
  • Sun Exposure: Full sun
  • Soil Type: Average to sandy, well-draining
  • Soil pH: 6 to 6.5

Bright, daisy-like flowers in brilliant shades of red, orange, and yellow make blanket flower a must-have in mixed borders. These drought-tolerant perennials attract birds and butterflies and bloom from spring to fall. Clip off the seedheads to keep them blooming.

Varieties for the South: Sunset Celebration, Mesa Red, Mesa Peach, Mesa Yellow, Mesa Bright Bicolor

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