Description
One of the most powerful garden scents of spring comes from hyacinth flowers (Hyacinthus orientalis) in bloom. Even at a distance, you'll notice these flowers' intense fragrance and the spikes of bright tubular flowers emerging from strap-shaped leaves. Introduced to Europe during the 16th century, hyacinth's popularity sparked Dutch bulb growers to breed more than 2,000 cultivars by the 18th century, and today there are about 60 to choose from in commercial cultivation.
Modern hyacinths are some of the easiest-to-grow perennial spring bulbs. Hyacinths will come back every year, though their flowers will diminish in vigor after a few seasons. They are best planted in the fall and have a moderate growth rate. Hyacinths can grow outdoors in the ground or pots, as well as indoors in a bulb vase filled with water. Keep them out of the reach of kids and critters: The bulbs are toxic to humans and pets
How to Grow Hyacinth
While hyacinths can be propagated from seed, it can take several years to coax the seed into creating a bulb and to nurture the bulb into a sizable structure that will produce a flowering plant.
First, you’ll have to allow your hyacinth blooms to remain on the plant to form seed pods. These pods will ripen from green to tan as they form small black seeds inside. The pods will dry and split open; you can catch the seeds by putting a white sheet under the plant or wrapping pantyhose around the flowers themselves.
Separate the seeds, and soak them in warm water for one to two days. Then, place them between two moist paper towels in a plastic bag, and put them in the refrigerator to sprout. Once they’ve sprouted, slightly press them into a seed tray filled with moist seed-starting mix, and place them in a cold frame or greenhouse to continue growing.
Potting and Repotting Hyacinth
When planting in pots, either plastic or clay will do as long as they have good drainage. The container should be roughly 6 inches deep. The width of the container depends on how many bulbs you are planting. Hyacinth bulbs in pots can be spaced more closely than when planting in the ground because the bulbs won't need room to multiply. You can squeeze them in so they are almost touching, but leave room for some soil in between to hold water. Repotting should not be necessary if you have properly spaced your bulbs.
Ordinary commercial potting soil is fine for planting hyacinths in containers, though some people like to blend in a little sand with the potting mix. Keep the potting medium damp but not soaking wet until the bulbs sprout. Then, water whenever the soil dries out. Once the bulbs have sprouted, move them to indirect sunlight. Cool temperatures will keep them in bloom longer.
How to Care for Hyacinth
For the strongest and farthest-reaching scent, grow hyacinth in large groups. Hyacinth flowers also mix well with other spring-blooming bulbs, as they come in so many colors and sizes. Their spiky flower stalks make a nice counterpoint to cup-shaped tulips and ruffled daffodils.
Taller varieties can tend to flop. You can stake them if you only have a few, or plant them closer together so that they support one another.
Planting
Most varieties of hyacinth bulbs are fairly large. For spring garden blooms, plant hyacinth bulbs in the fall six to eight weeks before the first frost. They should be placed root end down (widest side down) about 4 to 6 inches deep. Give them some room to spread out by spacing them about 3 to 6 inches apart. Cover with soil, and water well.
Light
Hyacinths like full sun to partial shade. Aim to give the plants at least six to eight hours of sunlight a day. As with all spring bulbs, hyacinths sprout, bloom, and start to fade before deciduous trees fully leaf out, so you don't have to worry about too much shade from nearby trees.
Soil
Hyacinth bulbs are not particular about soil pH, but they prefer a slightly acidic to neutral soil. They also do best in soil that is loose and well-drained; they will not tolerate wet soils. Rich soil can lead to floppy stalks, so go easy on the organic matter when preparing or amending the soil.
Water
Water the ground well after you plant the bulbs. Continue watering into winter if there is no regular rain, but allow the ground to dry out between watering. If the bulbs sit in cool, wet soil, they will eventually rot. Check the ground by sticking your finger in, and water only when it's totally dry. Usually, this is once or twice a week, depending on your climate. Generally speaking, about 1/2 inch of water per week—combined irrigation and rainfall—will be sufficient for hyacinths. But this depends on how well the soil drains.
Temperature and Humidity
Hyacinths can be expected to survive the winter in USDA plant hardiness zones 4 to 8. They might need some winter protection in colder zones and some pre-chilling in warmer zones, depending on the variety. In zones where winter temperatures remain above 60 degrees Fahrenheit, dig up the bulbs and chill them somewhere dark and cold for six to 10 weeks before replanting.
Fertilizer
The easiest way to feed new bulbs is to toss some bulb food into the hole at planting time. There are many fertilizers available for feeding bulbs—10-10-10 is recommended—or you can use an ordinary bone meal. Feed the bulbs a mere handful at planting and again in the spring when the new growth first appears by scratching some bulb food into the nearby soil and watering well. For the amount to use, follow the product label instructions.
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