DC Garden Design Firm GardenWise on Caring for Hyacinths
The main maintenance task for hyacinths is called deadheading. Deadheading is simply pinching off old blooms to encourage new growth and transfer energy from making seeds. However, if you bought a self-sowing variety do not deadhead because you will lose the seeds.
The only other concerns for hyacinth bulbs is the occasional animal or rodent. If you notice missing bulbs and see signs of them being dug up, put up a barrier or fence to discourage intruders. If no signs of digging around missing bulbs are apparent then you may have a rodent problem. In this case you can protect the bulb by simply digging it up and putting a wire mesh in the hole to surround the bulb.
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