Medium height and mid-season blooming in a large selection of colors, make these tulips one of the most popular varieties. They have a strong stem which holds up well under windy conditions. Their height makes them an excellent choice for indoor forcing as well as cut flowers. When to plant your tulip bulbs for a colorful garden next spring: Plant bulbs from October to December; Tulip bulbs can actually be planted up until Christmas and still flower perfectly well in the following spring because they only need a short season of growth. The rainbow of colors in this mixture will add the perfect touch to your garden this spring! 18"-20" Tall Blooms mid spring 12/+ cm Zone 2-8 Fall Zone 2, 3, 4: Early September. Zone 5: Early to Mid September Zone 6: Mid September Zone 7: Mid to Late September Zone 8, 9, 10: Late September to Early October Spring Zone 3, 4: Early to Mid May Zone 5: Late April to Early May Zone 6: Mid to Late April Zone 7: Early to Mid April Zone 8: Late March to Early April Zone 9, 10: Late March