To make sure energy is returned back to the bulb, any seed producing part of the plant will need to be removed. Allowing the plant to produce seed will take away energy from the bulb (embryo inside) and will reduce flower potential for any recurrent blooms next year.
|Seed bulge at the back of the flower petals.|
|Cut back near the base of the flower stalk for hyacinths too.|
|You can leave the flower stalk, but note it will begin to turn yellow faster than the leaves. Be careful of the stamens. They are full of pollen that can stain clothes.|
|Removing all the yellowing ends and lifeless stems aids in the plant to regain energy back to the bulb.|
Once all the leaves are yellow, tug on them slightly and when its the right time, they will come free from the bulb beneath the soil. Plant the bulbs outdoors, or store in a cool, dry place for the fall.
However, if you do want the seeds of such bulb plants, then let nature take it's course. Leave the flowers on the plant stalks and let them drop their petals or dry completely. Harvest the dried flower pods and separate the seeds from the stalk.