Deep beetroot purple. Hyacinth Woodstock is a popular hyacinth that will not fail to impressive with its deep sumptuous colouring. These indoor hyacinths will fill the room with its fragrance Prepared hyacinths for indoor flowering are the perfect tonic in the depths of winter when there is little colour outside. Hyacinths are best planted one colour per pot as other colours flower at a slightly different time, but you can place the pots close with a mix of colours from blue, pink and white.