Bulb planting depths vary depending on their size and species; but as a rule of thumb, most bulbs can be planted at a depth of approximately 3 times their own height. This explains some of my frustrations!
I never thought to plant bulbs over the top of other bulbs, going to try this for my spring planted bulbs. 'For sequential waves of flowers, plant a "bulb sandwich" layering crocus, tulip and daffodil bulbs in the same hole'
Need help planting your fall bulbs? This post gives insight and tips for planting fall bulbs when and how to plant bulbs for next spring. It also gives you a list of the different types of bulbs th… - Garden Zine
Best Bulbs to Plant in the Fall If you want spring blooms, fall bulb planting is a must. Here is a list of bulbs plus tips and advice for the DIY gardener. Includes when to plant according to growing zones.