Helianthus Flore Pleno

Perennial Sunflower, Sunflower

Note: This is an archive page preserved for informational use.
Cultural and Growing Info is provided below.


Back of the Border Beauty
This robust plant produces yellow double flowers throughout the summer. Its deep green foliage is an excellent screen or foil to showcase small plants. Flowers of Helianthus Flore Pleno are scattered all throughout its green wall of foliage. An excellent choice for the back of your border.

Code HEMF

Patent

Plant Type Perennials

Species multiflorus

Height Tall 4-6'

Spacing Plant 24" apart

Bloom Time Early Summer to Early Fall

Sun / Shade Full Sun

Zones 4-8

Soil Type Normal, Clay

Water Needs Medium

Sold In Plantable Pots (3.5x3.5x4")

Special Features

  • Beneficial for Pollinators
  • Attracts Butterflies
  • Good for Cut Flowers
  • Long-Blooming
  • OK in Containers

Helianthus General Information

Helianthus add structure to the summer border. Performs right thru August when other perennials rest. Plants are carefree in full sun. Finches flock to the dry seed heads. Idaho has restricted all potted plant material from being shipped into Idaho at this time.

Helianthus Plant Care

Prefers average, neutral to slightly alkaline soil. Well-drained soil is good for overwintering, but give Helianthus a good soaking if August begins to overpower. Can be divided in spring every 3-4 years. Cut back by one-half in early to midsummer to prevent staking.

Plantable Pots

Our plants are grown in 3.5x3.5x4” plantable pots. Made from 100% biodegradable coconut husk fibers (coir), these pots have tremendous advantages over plastic pots. With better air exchange, this "breathable" pot fosters robust root growth and reduces transplant shock since you can plant the pots directly in the ground. The pot naturally becomes part of the soil on its own over time—no composting required—and since they're made from a renewable resource that requires very little energy, they're earth-friendly too!

100% Guarantee

We offer a 100% unconditional guarantee for all our perennials to reach you in good condition and to grow. If you're not satisfied, we'll reship or refund immediately. Please don't hesitate to contact us if you have questions or concerns—we share your passion for gardening and want your new plants to thrive in your border!

Shipping Details

We use custom, earth-friendly packaging to make sure your order arrives in great condition, and we ship based on the best planting time for your growing zone (see the approximate dates below), unless otherwise indicated at checkout. If you wish, you can indicate a specific ship date during checkout.

Spring

  • Zone 3, 4: Early to Mid May
  • Zone 5: Late April to Early May
  • Zone 6: Mid to Late April
  • Zone 7: Early to Mid April
  • Zone 8: Late March to Early April
  • Zone 9, 10: Late March

Fall

  • Zone 2, 3, 4: Early September
  • Zone 5: Early to Mid September
  • Zone 6: Mid September
  • Zone 7: Mid to Late September
  • Zone 8, 9, 10: Late September to Early October