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The tiniest tulip I’ve ever grown is ‘Yellow Baby’. The flowers on some of my plants even popped out at ground level.
‘Yellow Baby’ is a Double Early Tulip like ‘Abba’ and ‘Foxtrot’. In their first year, my flowers aren’t particularly “double”, but they’re still cute and brighten up an area under a flowering shrub.
‘Yellow Baby’ is tiny enough that you can tuck in a few bulbs just about anywhere. The plants grow 8 inches tall and are hardy in Zones 3-8.