Gladiolus Nova Lux Buttery Yellow. Prized for large bouquets, stately gladiolus offer an enormous colour range, including the most delicate pastels, bold hues and almost unimaginable bi-colours. Their sword-like foliage and tall impressive flower spikes, make striking accents in the mixed flower border. For best garden effect, plant in groups of six or more of a single colour. Or grow dozens of them in a bed reserved for cutting. To enjoy blooms for many weeks through July and August, plant corms at two week intervals from early spring until the end of June. Glads are easy to grow, requiring only full sun and good drainage.