How to Care for Your Bulbs to Ensure Maximum Flowers & Long Life

Updated on December 12, 2017
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Caren White is a Master Gardener and instructor at Home Gardeners School. She has been a volunteer at Rutgers Gardens for over a decade.

Daffodils and tulips blooming in the author's gardens
Daffodils and tulips blooming in the author's gardens | Source

Bulbs are considered easy care but that doesn’t mean no care. Just a few simple steps will ensure that your bulbs remain healthy and return year after year.

Spring Bulbs

After your spring flowering bulbs like tulips and daffodils finish blooming, remove the flowers before they go to seed. You don’t want them wasting energy producing seeds. Instead, you want them storing up nutrients in their bulbs so that they will grow again next spring. Don’t remove the foliage until it turns yellow. It’s the foliage that is producing and storing the food for next year in the bulb. Don’t tie it in bunches. It may make it look neater but it also limits the leaves’ exposure to the sun so that they can’t photosynthesize needed nutrients. Instead, hide the foliage by planting cool season annuals such as pansies and snapdragons in front of your bulbs. Another good alternative is to plant perennials around them. The perennials will grow and fill out as the bulb foliage dies back.

Once the leaves have finished their job and die, cut them off at ground level and remove them from your garden. Dead foliage left in your beds could become breeding places for insects and disease.

Use Low Nitrogen Fertilizer

You can help your bulbs make food by adding fertilizer to your garden. Be sure to use a low nitrogen formula such as 5-10-5 or 5-10-10. High nitrogen fertilizers encourage foliage production. It is used on lawns to encourage the grass. Low nitrogen fertilizers are used on flowering plants, such as bulbs, to encourage flower production. Apply it by scratching it into your soil.

Divide Your Bulbs

Healthy bulbs multiply every year. Left in place, they will get crowded leading to smaller plants and smaller or no flowers. It’s a good idea to dig up your bulbs every 2 to 3 years and replant them. Wait until the foliage has completely died, then carefully dig up the bulbs with a trowel. Replant the larger bulbs in your garden, using the appropriate spacing. Smaller bulbs can be planted in a nursery bed to grow for a few years until they reach full-size when they can be planted in your flower beds to add to your spring display.

Summer Bulbs

Summer bulbs, such as cannas and dahlias, differ from spring bulbs in that they have no need to store energy to grow. They grow and bloom like your annuals during the summer. With the first killing frost, their foliage dies and the bulbs should be dug up.

Most summer flowering bulbs require 6 to 8 hours of sun daily and regular watering. They don’t like dry conditions or wet conditions. Planting your bulbs in a wet area will rot them.

Use Low Nitrogen Fertilizer

Providing fertilizer for your summer bulbs during the growing season will result in larger plants and more numerous flowers, just like your other flowering plants. Use the same low nitrogen fertilizer and apply it by scratching it into your soil.

A good organic low nitrogen fertilizer is compost. Used as a mulch, it does double duty keeping down weeds and providing fertilizer for your plants

Store Your Bulbs Correctly

After the foliage has been killed by frost, you should carefully dig up your summer bulbs. Brush all the soil off of them. Leaving soil on them could lead to rot or disease. You want clean, healthy bulbs. Store them in a mesh bag or other ventilated container in a cool, dry place. Ventilation prevents moisture from accumulating and rotting your bulbs.

The temperature in the area where you store your summer bulbs over the winter should not fall below 50°F (10°C) or get hotter than 70°F (21°C). An unfinished, unheated basement that is not damp is a good place. Store your bulbs away from light that might stimulate them to grow. Darkness makes them think that they are resting underground.

Just a few extra steps ensures that your bulbs will continue to provide you with color from spring until fall every year.

Questions & Answers

    © 2013 Caren White

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