Coreopsis SOLANNA™ GOLDEN SPHERE 'Decoreo16' tickseed, coreopsis
Symbivit Tric (arbuscular)
Symbivit (arbuscular)Coreopsis
The genus Coreopsis, described by Carl Linnaeus in 1753, comprises nearly forty predominantly North American species that evolved in open prairies, on dry slopes and along moist margins of wetlands, and this ecological breadth explains their present-day reliability in gardens. Linnaeus chose a name derived from the Greek koris and opsis, meaning “the appearance of a bug”, because the dry achenes resemble tiny insects, a small example of his observational humour. The taxonomy of the genus was not always settled and in 18th and 19th centuries various synonyms appeared, such as Calliopsis and Acispermum, before modern revisions unified the group, particularly the work of Ernest E. Sherff (1882–1966). Coreopsis holds strong place in American culture: Coreopsis tinctoria was used by Indigenous peoples for dyeing textiles, and several US states have chosen different species as their official flowers – Florida, Mississippi, Tennessee and Maryland.
Hybrid tickseeds represent a broad group of interspecific hybrids created by combining several North American species, each contributing specific traits to the final genetic mix. C. grandiflora increases flower size and ensures an early start to flowering, C. lanceolata adds stem strength, drought tolerance and the ability to grow in poor soils, C. tinctoria provides genetic variability and a wide colour range, C. rosea contributes pastel shades and a finer texture, and C. verticillata supplies a fibrous root system that improves winter survival and reduces the risk of rot. Breeding and selection are carried out under conditions of high humidity, summer drought and temperature fluctuations in order to eliminate lines prone to the typical weaknesses seen in some coreopsis. Most modern hybrids are partially or fully sterile, which prolongs the flowering period and maintains a more compact habit without self‑seeding. The result is a group of plants well adapted to variable European climates, where winter moisture, summer heat and irregular rainfall alternate throughout the season.
SOLANNA™ GOLDEN SPHERE is one of the unique tickseed varieties from the SOLANNA™ series. It makes dahlia-like, fully double, golden yellow flowers about 5-6 cm across. They are so-called self-cleaning, i.e., when the flowers fade individual petals fall off quickly, not disfiguring the rest of the blooming plant. It is an important feature since the plant blooms for an extremely long period: from late June until the last sunny and warm days of autumn.
The flowering stems are not tall, only about 25-35 cm in height, and the plants form dense and profusely flowering tufts. The leaves are medium green, broadly lanceolate at the ground, much shorter and narrowly lanceolate below the flowers, deciduous. Patent No. PP25241 was granted in 2015.
SOLANNA™ series of perennial tickseed was bred by Gavriel Danziger from the Danziger nursery in Israel founded in 1953. Until today the series contains 7 beautiful varieties which are more or less different from those already available on market, and we especially choose the most distinctive ones.
Last update 23-06-2022
Thread‑leaf tickseed and their hybrids are reliable perennials provided their origins are respected: they require sunny, open and well‑ventilated sites. They need full sun and a free‑draining soil that must never remain permanently wet, as this leads to loss of vigour and makes the plants prone to winter rot. Watering is necessary only during periods of extreme drought, since they are naturally adapted to alternating wet and dry conditions. They do not require feeding, or only a light application of compost in spring, because overly rich soils and the use of artificial fertilisers result in lush but unstable growth and eventual weakening of the plant. Removing spent flowers together with their stems helps to prolong the flowering period and maintains a clean, tidy appearance. The entire plant should be cut back to about 3–5 cm above ground level in spring once all frosts have passed. They are not reliably long‑lived in containers. Wind and exposed positions do not trouble them. Hardiness varies slightly between cultivars, but most tolerate around minus 29 °C (USDA zone 5), which means they overwinter without difficulty in typical Central European conditions and require no special protection.
