Phenological observations at the Botanical Garden of the Adam Mickiewicz University in Poznań were conducted on Syringa komarowii, S. meyeri, S. microphylla, S. oblata, S. reticulata, S. tomentella and S. wolfii. These observations showed the longest foliation phase in the case of S. oblata and S. meyeri, while the longest flowering phase was recorded in S. reticulata, S. microphylla and S. wolfii. Additionally, the longest period of anthesis (i.e. the period from the moment when 25% flowers bloomed to the time when 75% were out of bloom) was observed in S. oblata and S. microphylla. All examined shrubs, except for S. oblata, set fruits, which dispersal was extended to the next year (except for S. komarowii). In terms of decorative value suitable for green areas the most valuable species were S. komarowii, S. reticulata, S. meyeri, S. microphylla and S. oblata, with the three latter being the most showy shrubs in terms of autumn foliage. Moreover, S. komarowii was exceptional among the analysed species due to its large, attractive leaf blades. This lilac, together with S. meyeri, was also characterised by the most decorative inflorescences. Thanks to their stronger growth in comparison to the other species, S. komarowii, S. oblata and S. reticulata are best suited for large gardens, whereas S. meyeri and S. microphylla will prove most suitable for small gardens. All the recommended shrubs show good drought resistance.
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