Per the Snapshot product label: It may be applied for control of susceptible annual weeds in ornamental bulbs, e.g., bulbous iris, daffodil, hyacinth, and tulip. Apply Snapshot 2.5 TG to the soil surface 2 to 4 weeks after planting, but prior to the emergence of annual weeds. For complete information, please refer to the product label.
Snapshot 2.5 TG is pet-safe if used as directed. Keep pets out of the area while the product is being applied and watered in, and until the area is thoroughly dry.
Since every part of the country is different, we recommend calling your local county extension office for proper application times in your area. They will know exactly when you should apply a pre-emergent for best results.