- Name: Pink Lilac - Other Common Names: Hungarian Lilac - Scientific Name: Syringa Josikaea - Color: Pink Flowers - Plant Seeds: Outdoors After Frost / Fall / Cold Stratify / Indoors Weeks Before Last Frost - Plant Height: 6 - 12' (Typically 8 - 10') - Plant Spacing: 12' - Bloom Time: Late Spring - Early Summer - Hardiness Zone: 4 – 7 - Light Requirements: Sun - Part Shade - Soil & Water Preferences: Average - Quantity: 30 Seeds