Herbs, which do not produce seed or from seed do not produce equally valuable material, we must reproduce by dividing the rhizomes, the roots, carp and with the help of cuttings. Spring is the most suitable breeding date for this group of plants (for flowering plants in the second half of summer and autumn) or fall (for blooming in spring and in the first half of summer). Plants, which have the ease of forming roots or aerial parts, multiplies by cuttings – shoots, the roots, leaves.
Persistent asters have similar flowers to summer asters, but they are usually much smaller and more branchy. This genus includes species that bloom in early spring and gradually bloom until late autumn. Mostly mountain asters bloom in early spring, with a non-branching stem, ended with one or more baskets, propagated by division and by seed. Autumn asters, popularly known as marcinkami, their stems are branched, flowers grouped in the upper parts of the stems in the form of inflorescences.
Asters are unrefined perennials, permanent, fast growing, they can be propagated by dividing and replanted at almost any time of the year. Their use is versatile; low – on the borders, groups; high – for large groups, hedges and flower beds and cut flowers. Some varieties already bloom at the end of August, others in October. The exception is alpine aster (Aster alpinus), which blooms in May and June. Is short (15-20 cm), the stem is erect, short, softly hairy, single, blade-like lower leaves, upper lanceolate, sitting, whole bank, hairy on both sides. Marginal lingual flowers, blue-violet (rarely white). Tubular flowers (yellow) form the center of the basket. It breeds by division in August. Aster alpinus superbus hort is a more interesting variety. – about lila flowers. The little talk aster is taller and equally popular (Aster amellus) – height 20-80 cm, broad-lance leaves, flower baskets up to 5 cm. Blue-lilac flowers, tubular flowers (center of the basket) – yellow. It blooms from August to October. It grows quite slowly, it is long-lived, therefore one should overdo it afterwards 6-10 years. Requires a sunny location, calcareous soil, light. It is difficult to reproduce by division, so that it is recommended to propagate by sowing. Plants obtained from division are best planted in spring. Among the more valuable varieties can be mentioned: Dark treasure – show. 40 cm, dark flowers, purple-blue; Emma Bedu – show. 80 cm, dark purple flowers; Nocturnes – large flowers, lavender pink.
Bushy asters are widely used, the so-called. dwarf marcinas (Aster dumosus). They are very low (20-25 cm), they have spatulate leaves, elongated. Lingual pale lilac flowers, tubular -from golden to brown. They bloom in September and October. They can be propagated by division at almost any time of the year, although preferably in the spring. Plants are planted every 35-60 cm, depending on the variety. It also grows well in dry sandy soil, and on a wet one, carious. Requires a sunny or semi-shaded position. Of the varieties they deserve attention: Audrey – show. 40 cm, amethyst purple flowers; Blue Baby – show. 30 cm, blue flowers, half full; Niobe – show. 20 cm, white flowers; Professor Kippenberg - light blue flowers, half full; Harrison – show. 40-50 cm, large flowers, pink.