Growing hyacinths is easy and the perfect way to add irresistible fragrance and lavish flowers to your early spring garden. Hyacinths are cold-hardy perennials that have been a garden favorite for hundreds of years. They’re a perfect addition to a vintage-themed flower garden.
Hyacinths are bulbous herbs in the Hyacinthus genus, named after the hero Hyacinth from Greek mythology. The most familiar hyacinth species is Hyacinthus orientalis, also known as the common hyacinth.
Gardeners plant hyacinths in the fall for spring blooms. They grow 8–12 inches (20–30 cm) tall, with yellow, blue, purple, pink, or white flowers. Hyacinth bulbs tend to bloom well for three or four years until they eventually expire.
Hyacinths are easy to grow, but they require an extended winter cooling period. Thus, growing methods vary depending on the local climate. Here’s everything you need to know for planting and growing hyacinths.
Where Will Hyacinths Grow Outdoors?
Hyacinths are cold-tolerant. They grow best in USDA Hardiness Zones 4–8. With proper care, they’re even winter-hardy in Zone 3, the coldest USDA zone in the continental US.
In order to bloom, hyacinths require 10 to 14 weeks of winter cooling, with temperatures under 45°F (7°C).
In cold climates, plant hyacinth bulbs directly in the ground in the fall. The ideal planting time is shortly after the first frost but before the ground freezes.
Hyacinths won’t grow outdoors as perennials in warmer regions (above Zone 8). However, in Zones 9 and up, you can pre-chill hyacinth bulbs and grow them as annuals.
Growing Hyacinths in Warm Climates with Pre-Chilled Bulbs
Chilling bulbs in controlled conditions is known as “forcing”. Forcing bulbs gets them to bloom when and where they normally wouldn’t.
If you’re growing hyacinths indoors, or outdoors in warm climates, forcing the bulbs gives you control over when they bloom. Plan on twelve weeks of chilling, then two or three more weeks afterwards for flowers to appear. If you want the plant to be in bloom on a certain date, such as Christmas Day, start the chilling period around 15 weeks prior.
There are several methods for giving bulbs the cold temperatures they require. These include buying pre-chilled bulbs, chilling bulbs in a cool space, or chilling bulbs in a refrigerator.
Buying Pre-Chilled Bulbs
Some online and offline retailers sell pre-chilled hyacinth bulbs. These are usually delivered between November and January. Plant pre-chilled bulbs right away, and expect blooms several weeks later.
Chilling Bulbs in a Cool Location
You can chill hyacinth bulbs indoors if you have a cool, dry, dark location with consistent temperatures between 35–45°F (1–7°C). This may be a shed, garage, or basement.
If you plan on putting your bulbs in the ground, chill them in paper bags. Bulbs that you’ll grow in containers can be chilled directly in their pots.
Chilling Bulbs in the Refrigerator
Refrigerators are typically set around 40°F (4°C), an ideal cooling temp for bulbs. To chill bulbs in the fridge, simply place them loosely in a paper bag (tip: write the date on the bag!) and put them in the crisper drawer for around 12 weeks.
Note that fruits and veggies give off ethylene gas that harms bulbs. It’s okay if there are fruits and veggies elsewhere in the fridge, but they shouldn’t share the same drawer as bulbs.
How to Plant Hyacinth Bulbs
Planting Hyacinth Bulbs in the Ground
Plant your hyacinths in full sun to partial shade in loose, well-draining soil.
Safety tip: hyacinth bulbs contain calcium oxalate, which can cause an allergic skin reaction. To avoid skin irritation, wear gloves when handling these bulbs.
Plant bulbs five inches deep and five inches apart. Make sure the root end is at the bottom, and the pointed end is on top. Cover the bulbs with soil, then water thoroughly. In very cold regions (Zone 3), add mulch for winter protection. Mulch also protects against weeds and disease.
Planting Hyacinth Bulbs in Containers
Soggy soil is bad news for hyacinths, so it’s important to plant them in containers with drainage holes. Use a well-draining potting mix, not a garden soil. Before adding the soil to the container, add enough water to make it moist, but not muddy.
Compared to planting in the ground, potted bulbs require less depth and spacing. If you’re planting multiple bulbs in a single container, they can be close enough so they’re almost (but not quite) touching.
Hyacinths can grow in shallow containers, with a minimum height of around 5 inches (12 cm). Cover the bottom of the container with at least 3 inches (7 cm) of soil, then insert the bulb with the pointy end facing up. Cover with soil until the tip is just below the surface.
During the cooling period, water occasionally to keep the soil moist, but never soggy. After the cooling period, bring the pots to a sunny location.
Caring for Hyacinths
Hyacinths bloom in early to mid-spring. Once spring growth begins, water around one time per week (if there’s no rain), or as needed to keep the soil moist. Don’t water so frequently or heavily that the soil becomes soggy.
Blooms usually last for two to three weeks. The flowers die first, then the foliage.
If you’re growing hyacinths as perennials, they require dead-heading. After the bloom has wilted, cut off the flower stalk as close to its base as possible, without damaging the remaining foliage. The foliage provides nourishment that will help replenish the bulb for next season.
Let the foliage wilt naturally over time. Once the leaves have shriveled and collapsed, cut them off at their base.
In Zones 4–8, hyacinths left in the ground will come back the following year for another round of blooming.
More Spring-Flowering Bulbs
Hyacinths and other bulb flowers are popular because they’re reliable and offer gorgeous, robust blooms, often in the earliest days of spring. For dazzling displays, or longer bloom periods in your garden, grow several types of bulbs together. Learn all about two more favorite spring-flowering bulbs in our guides on tulips and crocuses.
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