That week I received my long-anticipated shipment of Zephyranthes and Habranthus bulbs. The picture below is that of Zephyranthes drummondii. All bulbs were purchased while dormant and without soil.
One thing which caught my eye, is that some bulbs are larger than others, and possess a longer "neck". One was exceptionally large and its neck is as tall as the depth of the pot in which it was placed. The image below shows almost two-thirds of the neck above the soil. So how does this happen? Is that a response to deeper planting (hence the long neck) which also causes the bulbs to grow larger?
I have Zephyranthes grandiflora (the pale purple variety) which was the only species in our possession for almost 60 years. While the bulbs multiplied and I separated them into different pots, I never saw bulbs growing much beyond the size of garlic.