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Crowd them tightly together to get them to bloom.
Remember that to get long-term nutrient reduction, you need to remove plant material from the pond. The dead leaves will decompose and release all the nitrogen which is stored in them back to the water. Dying leaves or whole plants that are removed from the pond represent a nutrient export which helps to counter-act the nutrient input via koi feed. Hyacinths grow quickly and you will soon be able to throw away about 10-25% of them each week. As you throw them away, imagine that you are throwing away fish waste.
steve hopkins |