Keep your elderberry harvest going! Johns ripens approximately two weeks later than Adams, so plan accordingly. Elderberries are somewhat naturally pest-resistant (including to Japanese beetles) because of their poisonous, stems, leaves and roots. It’s an easy plant to maintain and will add significant beauty to your landscape, especially when planted in groups of three or more. Lacy white edible flowers appear in the spring, followed by tender, almost-black berries near the end of summer. Use in jelly or jam, pie, syrup or dry the flowers for use in tea. Cold-hardy. Ripens in mid-August. Pollinator required: Choose any other elderberry variety.