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Designer Threads™ Heartstrings Coreopsis

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  • Full Sun (At Least 6 Hours Of Direct Sunlight)
  • Mature Height 18 - 20 Inches
  • Mature Spread 22 - 24 Inches
  • Growing Zones 5 - 9
  • Use As A Filler In Containers

Heartstrings Coreopsis has recognizable ferny, threadlike foliage and an exciting flower color. The showy flowers are dark red with a white edging, covering the plant from late spring to the first frost of fall. The color scheme of Heartstrings is easily mixed and matched with other Designer Threads™ coreopsis plants for a fresh and modern spin on traditional summer colors. 

Coreopsis is a North American native plant with incredible cold hardiness and drought tolerance once established. Designer Threads™ Heartstrings retains these qualities while also boasting an amazing resistance to most pests and diseases including mildew. This variety readily tolerates deer and rabbit browsing, and rapidly regrows following any damage. Coreopsis delivers a long season of interest while requiring little maintenance or fertilizing. Plant this herbaceous perennial in front of flowering shrubs and taller perennials or add it as a colorful filler plant in a mixed seasonal planter.  

Designer Threads™ Heartstrings Coreopsis Care

Coreopsis is a versatile plant that grows in fertile or poor soil. Amend heavy clay soils with compost before planting to provide sufficient drainage. The plant will flower best with at least 6 or more hours of direct sun exposure. 

Fertilize annually as the new growth appears in late spring. A granular, slow-release fertilizer will provide nutrition through the active growing period and will support flower production and color retention. Water plants deeply 2-3 times a week to encourage deeper root growth and development of drought tolerance. Mulching with shredded leaves or grass clippings will aid in moisture retention and in suppression of potential weed seeds.  

Prune back coreopsis by half its height at mid-summer to encourage another flush of foliage growth and flowering. Deadheading of spent flowers is not required. At the end of the growing season, coreopsis will die back completely to the ground and go dormant. The spent top growth can be left to protect the growing crown during the winter if you garden in zones 5-6. 

Designer Threads™ Heartstrings Coreopsis Spacing

Designer Threads Coreopsis has a naturally mounded and compact shape, perfect for planting as a ground cover or in a container. Space plants 22 inches apart, center on center, for garden-grown plants. Container-grown plants will require a pot with at least a 10-inch diameter for plants grown singly.

Designer Threads™ Heartstrings Coreopsis Information

USDA Hardiness Zones: 5 - 9
Plant Type: Perennials
Light Exposure: Full Sun (At Least 6 Hours Of Direct Sunlight)
Mature Height: 18 - 20 Inches
Mature Spread: 22 - 24 Inches
Spacing: 22 - 24 Inches
Habit: Mounded
Flower Color(s): Red
Flower Description: Red Shades
Bloom Period: Summer
Foliage Type: Semi-Evergreen
Foliage Color(s): Green
Foliage Description: Green Shades
Seasonal Interest: Summer Flowering
Watering: Average
Resists: Deer
Tolerates: Drought
Attracts: Bees, Butterflies
Container Role: Filler
Uses: Mass Planting
Features: Attracts Pollinators, Cut Flowers
Common Name: Designer Threads Heartstrings Coreopsis
Other Name(s): Tickseed
Scientific Name: Coreopsis verticillata 'Heartstrings'

Container Sizes

Please Note: The pictures below are to give a general representation of the different container sizes. The actual size/ages of plants are estimates and will vary based on; type of plant, time of year, last pruning & many other factors.

4.5 Pot

4.5" Pot
 Also Known As:
   4.5" Container

 Plant Age:
   ~ 6 months
 Plant Size:
   ~ 3"-6"
 Pot Size:
   ~ 4.5"H x 3.75"W
   1.42 quarts

Quart Pot

Quart Pot
 Also Known As:

 Plant Age:
   ~ 6 months - 1 year
 Plant Size:
   ~ 4"-8"
 Pot Size:
   ~ 4.75"H x 4.5"W
   1.50 quarts

2.5 Quart

2.5 Quart
 Also Known As:
   2.5 Quart Pot

 Plant Age:
   ~ 1 - 2 years old
 Plant Size:
   ~ 8"-12"
 Pot Size:
   ~ 6.5"H x 6.5"W
   2.20-2.30 quarts

#1 Pot

#1 Pot
 Also Known As:
   #1 Container
    1 Gallon
 Plant Age:
   ~ 1 - 2 years old
 Plant Size:
   ~ 10"-14"
 Pot Size:
   ~ 7"H x 7.75"W
   2.26-3.73 quarts

#2 Pot

#2 Pot
 Also Known As:
   #2 Container
    2 Gallon
 Plant Age:
   ~ 1.5 - 3 years old
 Plant Size:
   ~ 12"-18"
 Pot Size:
   ~ 9.5"H x 9.5"W
   1.19-1.76 gallons

#3 Pot

#3 Pot
 Also Known As:
   #3 Container
    3 Gallon
 Plant Age:
   ~ 2 - 4 years old
 Plant Size:
   ~ 12"-30"
 Pot Size:
   ~9.5"H x 11"W
   2.32-2.76 gallons

For more detailed information, please click here.

Plant Addicts Guarantee (Included On All Plant Orders)

Plant Addicts always guarantees your plant(s) will arrive happy & healthy. However, plant(s) are being shipped through the mail & sometimes accidents happen. If the plant is dead, has dried out roots or the incorrect item was shipped, just notify Plant Addicts within 3 days upon delivery. We may ask for pictures but will try to make it as easy as possible for you. Please note, plant(s) with damaged branches or wilted leaves will not qualify for this guarantee. Plants are very resilient and will rebound quickly when cared for correctly. 

For more information on how to care for your new plants, please click on our guide below.

Guide: How to Care for Your New Plant(s)

Plant Addicts Warranty - 1 Year (Extra Purchase Required)

We encourage all plant lovers to purchase the Plant Addicts Warranty, whether you're a new gardener or an expert. There are many variables outside of anyone's control that can cause a plant to die. Hungry animals, drought, poor soil conditions, over watering, diseases & pests are all good examples of what can cause plants to die. The Plant Addicts Warranty is a 1 year warranty protecting you from all of the unknowns and will replace your plant if something were to happen to it.

The warranty is purchased on a per plant basis and must be purchased at the same time as the plant(s). We will cover 100% of the price of the plant, but the warranty does not cover shipping costs. SImply let us know if your plant has died within 1 year of receiving it and we will get you a new one shipped out as soon as possible (depending on the time of the year and availability). We may ask for photos for documentation purposes, but we try to make the process as easy as possible.

For more information, please click on our page below.

Guarantee and Warranty

Plant Shipping

Below are some factors we consider when determining when to ship the plants depending on the timing of the order.

Winter to Early Spring

We ship only when it's warm enough to plant in your growing zone.
Sometimes plants aren't completely ready to sell and ship in early spring. We will wait until the plants are ready before shipping so you don't get a subpar product.
For Southern plants we will be able to ship much earlier than plants coming from our northern nursery.


If there is extreme heat we may delay shipping for a week or several weeks.
We review what areas the plants are traveling through as well as your location.

Fall into Winter

We’ll ship plants out all the way up to the end of the fall planting season!


Get your order in early to reserve your plants for Spring planting!

Once your plant is shipped you’ll receive an automated email with tracking information. 

Click here for more detailed shipping information.

Planter Shipping

Standard Colors: 2-3 business days

Special Order Colors: 8 weeks - this is due to the planter being custom made with the color(s) of your choice

Please Note: On special orders there can not be any cancellations