15 Hyacinth 'Delft Blue' BlueThe name says it all: the hyacinth 'Delft Blue' (Hyacinthus) has the most deep blue flowers that look beautiful in a border or in a pot or flower box. This low growing spring bloomer does not grow taller than 2025 cm. Plant the bulbs in autumn in the ground or in a large pot. The flowers will bloom in the spring. Protect the potted flower bulbs in winter by covering the soil with a layer of autumn leaves. In the event of severe frost, temporarily