Hardiness: USDA Zone 4a: to -34.4 °C (-30 °F) USDA Zone 4b: to -31.6 °C (-25 °F) USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F)
Other details: Average Water Needs; Water regularly; do not overwater
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline)
Patent Information: Non-patented
Propagation Methods: By dividing the rootball From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds Properly cleaned, seed can be successfully stored
In response to the gardener who had trouble with aphids and powdery mildew on heliopsis, Try thinning out the plants for better air circulation and avoid spraying the leaves when watering to reduce powdery mildew. Getting rid of aphids with a vigorous hosing-down with water and then hosing down the soil beneath the plant where they drop, should help because aphids can't find their way back up the plant... they were born there in the first place. The hosing-down should be done in early morning on a sunny day to let the plant leaves and stems dry out, otherwise powdery mildew will result. I hope that helps.
On Apr 21, 2011, Ithiel from Detroit, MI (Zone 6b) wrote:
This plant volunteered its self in a rather shady area underneath a tall pine tree about 4 years ago. It usually got a few blooms on it there around August, so I left it in that spot for a couple of years before moving it to a sunnier spot last year and it really took off. It grew 3-4' tall and was covered in flowers from July until October even in less than ideal conditions. Somewhat slow to rise in the spring but it grows and an unbelievable rate once it breaks through the soil.
On Sep 1, 2010, Judy823 from Newton Highlands, MA wrote:
Our Heliopsis has been growing in the minimal soil in front of out fence for more than 10 years. It creates a FANTASTIC display and passing motorists have stopped and asked the name of the plant. It comes back year after year on its own and in ever-more dense clusters. It, with the Tiger Lily, is the quintessential perennial.
However, every August it becomes covered with red aphids. They line every stem. The leaves then become covered with a powdery white mildew or fungus. It is extremely ugly and we have to rip them out by the end of August even though the plant is still trying to grow and flower.
We have tried Neem at great expense but with absolutely no efficacy. I have had a little more luck against the aphids
with a home-made soap/red pepper/garlic/oil solution.
Next year we may try pre-treating with Neem in late July but if anyone has any suggestions I would appreciate it.
Washing them off with a hose as mentioned by one of the
gardeners above did not prove the least bit effective either.
THANKS - heliopsis lover Judy
On Jun 20, 2009, stormyla from Norristown, PA (Zone 6b) wrote:
These plants grow and flower very well in part shade and also in bright full shade. They are impervious to Juglone and will flower nicely all summer. This is a wonderful bright bloom for a shade garden.
On Oct 16, 2008, critterologist from Frederick, MD (Zone 6b) wrote:
This is one of the few perennials to flower the first year from winter sown seed! It will get larger and taller the next year or two, so give it room.
Mine is at the front of a bed because I grew it from mislabeled seed for a much shorter plant (in fact, the first year I sent out seed from it without knowing its name, so I called it "Not Chocolate Daisy" or "Too Tall to be Chocolate Daisy" and then described it).
It is a blooming machine from June until frost, with flowers that are a little more lemon-yellow (not so gold) than the black-eyed susans it reminds me of.
This is one of those members of the daisy group that, along with members of the carrot group, like fennel, play host to tiny predatious hover flies and wasps that rein in activities of various caterpillar species. A border that includes these plants naturalized somewhere in the vicinity of an organic vegetable garden can contribute to the complexity of life that nurtures balance between "bad guys" (prey) and "good guys" (predators) (purely from human point of view).
On Jan 22, 2003, poppysue from Westbrook, ME (Zone 5a) wrote:
This is another one of those plants that gives you a lot of bang for your money. It just goes & goes ... like the energizer bunny. Plants are well behaved, it stays in a neat clump, and the stems are sturdy. The bright yellow daisies are a real eye-catcher in the garden. It just seems to ALWAYS look good. My only problem has been a population of red aphids that seem to find it irresistable. However, they don't pose much of a threat and they are easily taken care of.
On Nov 15, 2000, jody from MD &, VA (Zone 7b) wrote:
This species of Heliopsis (depending on cultivar)will grow to about 3' to 5' tall and 2' to 3' in width. Flowers are yellow and have single, semi double or double flowers and bloom in late summer. 'Light of Loddon' have double flowers. Best cultivated in sun, rich, well drained soil but will tolerate poor conditions. Deadhead to promote more flowering, cut back to ground in fall. Propagate from seed, division, or cuttings. Hardy zones 4-9.
This plant has been said to grow in the following regions:
Calistoga, California Seymour, Connecticut Mapleton, Illinois Galena, Indiana Warren Park, Indiana Lansing, Kansas Ballenger Creek, Maryland Ellicott City, Maryland Newton Highlands, Massachusetts Blissfield, Michigan Dearborn Heights, Michigan Detroit, Michigan Mason, Michigan Young America, Minnesota Republic, Missouri Little Falls, New York Cambridge, Ohio Dalton, Ohio East Norriton, Pennsylvania Fullerton, Pennsylvania Jonesville, South Carolina Center, Texas Linden, Texas