@Mutisia -- how much sun are they getting? Are they getting baked in the sun? You might prepare a bed that has morning sun and shade in the afternoon. Prepare the bed with a fair amount of compost and make sure it gets a good watering once a week, but is allowed to dry out in between. If the bulbs are getting smaller, it sounds to me like they are either not getting nutrients they need or are getting baked in the sun. That is just a thought.
