Heliopsis is a perennial herbaceous plant, native to North America. It produces dense tufts, 60-80 cm high, consisting of thin, very branched stems, which bear oval or lanceolate leaves, dark green in color; from late summer to the beginning of autumn, they produce long erect or slightly arched stems, which rise above the foliage, and bear large single flowers, in the shape of a daisy, with an orange center and yellow petals gold. The long flowering lasts until the first cold, making the plant very suitable for rock gardens or flower beds. To prolong and encourage flowering it is good to remove withered flowers.
the specimens that belong to this kind of plants love the sunny positions, but they can be planted even in partial shade, where however they produce less flowers.
In general they do not fear the cold, also because they are lively plants: the aerial part dries up during the months with intense cold, to start to sprout again in spring. They are therefore plants of easy cultivation that do not require particular care or attention as regards their planting.
Regarding the correct amount of water to be supplied to Heliopsis specimens it is good to know that from March to October it is advisable to water regularly, especially in the period of July and August, when the temperatures are very high and the soil dries more quickly compared to other periods; in any case wait for the soil to dry slightly between one watering and another, checking however that it maintains a certain degree of humidity and, at the same time, does not allow the formation of water stagnations that can be harmful to the plant.
In the vegetative period add some fertilizer for flowering plants, mixed with the water of the watering, every 10-15 days so that the flowering can be better.
To provide an ideal substrate for the cultivation of Heliopsis, it is advisable to place it in a fertile, loose and well-drained soil, very rich in humus; these plants can also develop in common garden soil, but the blooms will be quite small. The correct soil must guarantee a good degree of drainage.
To obtain new specimens of this genus of plants in autumn it is possible to divide the clumps, immediately putting home the portions practiced; the heliopsis they can also be propagated by seed: in February in a warm bed, to allow the new shoots to develop and grow in a place protected from cold temperatures, or sowing directly in March.
Heliopsis: Pests and diseases
aphids can sometimes ruin flowers; Powdery mildew and rust instead attack the leaves. For this reason, it may be useful and necessary to plan to intervene with broad-spectrum insecticide treatments before the vegetative restart, so as to provide greater protection to the shrubs. In cases of signs of aphids, specific products are available on the market or natural methods can be used with nettle or garlic preparations.