When it comes to gardening most of us are familiar with the fact that some flowers grow from bulbs. While it might be easy to mindlessly plant these into the ground, what often goes unnoticed is that these small, seemingly run-of-the-mill items, are, in fact, something rather special. Flower bulbs are one convenient little package that contains everything flowers need to grow, develop and thrive. While they might not look much, these incredible natural resources hold an amazing amount of life energy, and without them, the world would be a duller place. There is so much to learn about flower bulbs, so if you’re keen to find out more, take a look at our flower bulb guide which will tell you everything you need to know.

Flower Bulbs with Shoots
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The Amazing Truth About Flower Bulbs

Flower bulbs are truly remarkable components of the plant world, offering a wealth of fascinating truths that delight gardeners and botanists alike. Here are some amazing facts about flower bulbs:

  • Self-Contained Wonders: Bulbs are self-sufficient storage units, containing all the necessary nutrients and energy sources a plant needs to survive winter and drought periods. They are designed to endure until conditions are right for growth.
  • Dormancy and Survival: Bulbs enter a period of dormancy, allowing them to survive harsh conditions. This dormancy is not just a survival mechanism for cold winters but also for hot, dry summers, as seen with Mediterranean-climate bulbs.
  • Spring Harbingers: Many bulbs, such as tulips, daffodils, and crocuses, are some of the first plants to bloom in spring, often pushing through the snow to herald the end of winter with their vibrant colours.
  • Diverse Beauty: The world of bulbs offers an incredible variety of shapes, sizes, colours, and scents. From the regal lily to the delicate snowdrop, bulbs produce some of the most beloved flowers in the world.
  • Propagation Prowess: Aside from sexual reproduction through seed formation, many bulbs can reproduce asexually through offsets or daughter bulbs, allowing for easy propagation and the spread of these plants in the wild and in cultivation.
  • Historical Significance: Bulbs have been a part of human culture for thousands of years, with tulips causing a financial frenzy during the Tulip Mania in the 17th century and daffodils being associated with Greek mythology.
  • Economic Impact: The cultivation and trade of flower bulbs are significant economic activities, especially in countries like the Netherlands, which is known as the flower bulb capital of the world.
  • Gardening Ease: Bulbs are popular among gardeners for their ease of planting and care. They can be planted in the fall, left to overwinter in the ground, and will burst into life with minimal maintenance.
  • Indicator Species: Some bulbs serve as indicator species for environmental changes. They can signal soil health and the onset of seasonal changes, making them important in ecological monitoring.
  • Longevity: Many bulbs can live and bloom for many years. Some species of lilies, for example, can live for decades, providing beauty for generations.

Inside a flower bulb, you will find a tiny plant, the flower, roots and leaves all waiting patiently to emerge.

What are the Different Types Of Bulbs?

In gardening, the term “bulbs” refers to a type of underground storage organ that some plants use to survive adverse weather conditions. Bulbs are a type of geophyte, a botanical category that also includes corms, tubers, rhizomes, and tuberous roots. Here are the main types of bulbs and similar structures that gardeners commonly plant:

  • True Bulbs: These have layers of fleshy scales with a basal plate at the bottom and a growing point or shoot at the top. They may also have a protective tunic (skin-like covering). Examples include daffodils, tulips, and lilies.
  • Corms: These are similar to bulbs but are solid tissue inside. They store their nutrients in the swollen base of the stem. Gladioli and crocuses are examples of plants that grow from corms.
  • Tubers: These are thickened underground stems or roots that store nutrients in their various internal structures. Potatoes are stem tubers, while dahlias and anemones form root tubers.
  • Rhizomes: These are horizontal, usually underground stems that often grow near the soil surface. They have nodes from which shoots and roots can grow. Irises and ginger are examples of plants that grow from rhizomes.
  • Tuberous Roots: These are enlarged roots that store nutrients. Unlike tubers, they do not have nodes and cannot produce new plants from the storage organ itself. Sweet potatoes are an example of a plant with tuberous roots.

Are Onions Bulbs?

Yes, onions are the bulbs of plants belonging to the genus Allium. They form a part of a larger family known as Amaryllidaceae. Onion bulbs serve as a storage organ for the plant, containing layers of fleshy scales that provide nutrients during periods of dormancy and contribute to the plant’s growth in the next growing season.

These bulbs are cultivated worldwide for their flavour and versatility in cooking.

What Other Vegetables Have Bulbs?

Several other vegetables form bulbs, similar to onions, and are often used in culinary applications. These include:

  • Garlic (Allium sativum): Like onions, garlic is a member of the Allium family and forms a bulb made up of multiple cloves.
  • Shallots (Allium cepa var. aggregatum): Shallots are closely related to onions and garlic and form a bulb with clusters of cloves.
  • Fennel (Foeniculum vulgare): While not a true bulb, the fennel plant forms a bulb-like swollen base that is used as a vegetable.
  • Leeks (Allium ampeloprasum var. porrum): Leeks do not form a true bulb but have a bulb-like base that is edible.
  • Chives (Allium schoenoprasum): Chives grow from small, elongated bulbs and are used for their leaves and flowers.
  • Scallions or Green Onions (Allium fistulosum): These are harvested before the bulb fully forms and are used for their tender green tops and immature bulbs.

Inside the vegetable bulb, nutrients are stored and depending on which you are eating, there might be several health benefits. In fact, bulbs like garlic have long been used for medicinal purposes.

Tips For Planting Flower Bulbs

If you’re keen to get started on planting flower bulbs then the good news is that these are one of the easiest and low-maintenance types of planting you can do. For this reason, bulbs are often favoured by newcomers to gardening. However, while they are relatively simple to care for, taking note of some of our top tips will ensure that you always get the best out of your bulbs.

  • Before putting your bulbs into the ground, be sure that you have created a hole that is the right depth. If you put the bulbs too low in the ground, there is the risk of them flowering late or not at all. However, if you plant too high, the bulbs might struggle to develop owing to the overly cold temperatures.
  • The roots of the bulb should always be facing down. That being said, it can be a little tricky to figure this out and one end may look the same as the other. If you are in any doubt, it is possible to plant the bulb on its side and nature will do the rest.
  • Once planted, you will need to provide your bulbs with a lot of water to encourage growth.
  • There is a technique known as lasagna planting which involves layering the bulbs according to when they will flower. This is beneficial if you want to be able to plant and then watch your garden develop and thrive over the course of the year.
  • Bulbs do well with companion plants and some of the best are considered to be thyme, bleeding heart, daylilies and cranesbill, among others.


Flower bulbs are small packages that contain all the nutrients and energy that a flower will need to grow. They are easy to plant and care for and will stand up to some pretty harsh conditions. With a wide variety to choose from and very colourful blooms, bulbs are an excellent choice for new gardeners or those looking for something low maintenance.

Garden Doctor Trev

Garden Doctor Tips

“Ensure that you plant your summer bulbs after the last frost – they won’t do well if they are too cold!”

“You will want to make sure that you plant your bulbs at the right depth!”

“Layer your planting with different bulbs that flower at different times to give a continuous bloom!”

“If you are not sure which is the top and the bottom, plant the bulb on its side and let nature run its course!”

Frequently Asked Questions

What are bulbs in plants?

Bulbs are not just for holiday decorations! They are an important part of plant life.
First off, there is a difference between bulbs and roots. You can think of them as the “brain” and “body” of the plant respectively. Roots anchor the plant to its environment while bulbs provide nourishment through photosynthesis to help it grow into a strong, healthy plant with lots of leaves and flowers.

How do flower bulbs work?

Have you ever wondered why the flowers in your garden have
blossomed all at once, then waned and withered? This is because they are following a natural cycle that repeats each year: the flower bulbs need time to rest before blooming again. As it turns out, there is a lot of science behind this simple fact! They contain all the nutrients necessary for growth and development. Bulbs also produce food that helps feed the rest of the plant.

Do flower bulbs come back every year?

The answer to that question is, “it depends.” It really depends on the type of flower bulb you purchase. The different types of bulbs can be divided into two categories: those that come back every year and those that don’t. Which category your bulbs fall under will depend on how much time they need to grow before flowering again in the spring.


Trevor Wright is not just a seasoned horticulturist; he’s the esteemed Garden Doctor. With a BSc in Horticulture and years of hands-on experience in the soil, Trevor has become a trusted mentor for all things gardening. As the founder of Garden Doctor, he’s committed to clarifying the intricacies of gardening, offering straightforward advice that’s rooted in years of practice. His writing is a garden of how-tos, savvy insights, and comprehensive guides that enable individuals to nurture and grow their garden dreams. When he’s not knee-deep in garden beds, Trevor is at his keyboard passing on his green-thumbed wisdom to budding gardeners, ensuring that the legacy of sustainable and joyful gardening blossoms far and wide.

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