Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 2
Written by Natalia CÎRLIG
The ontogenetic peculiarities of the species Silphium perfoliatum L. cv. 'Vital', known as a high-potential melliferous, fodder and energy species, the periods and age stages that the plants go through under the climatic conditions of the Republic of Moldova have been described. The research was carried out in the experimental sectors of the "Alexandru Ciubotaru" National Botanical Garden (Institute), during four growing seasons. In the ontogenetic cycle, 4 ontogenetic periods (latent, pregenerative, generative, postgenerative) and 6 age stages (seed, seedling, juvenile, immature, virginal, senile) were described. The end of the ontogenesis in S. perfoliatum, in the Botanical Garden, has not been recorded yet. The duration of the active growth period varies between 197 and 234 days depending on the weather conditions recorded in the Republic of Moldova and the age of the plants. S. perfoliatum plants are characterized by long flowering stage, being able to provide honeybees and other pollinating insects with pollen and nectar at the end of summer - beginning of autumn.
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