Bulbs to Plant in September

Gardening aficionados across the UK know that September’s cooler temperatures paired with the promise of spring’s vibrant hues make it the ideal month to plant bulbs.

This guide will delve deeper into ensuring your garden becomes a springtime spectacle.

1. Selecting the Right Bulbs

The success of a vibrant spring garden largely hinges on the quality and type of bulbs you choose to plant. Ensuring you begin with the best bulbs can set the stage for a season of eye-catching blooms.

Selection is Key

While bulbs may appear simple on the surface, assessing their health requires a discerning eye and touch.

Texture and Firmness

Healthy bulbs generally possess a robust firmness when gently squeezed. They shouldn’t feel soft or give way under pressure, as this can indicate rot or interior damage.

Surface Examination

Visually inspect each bulb for any imperfections. Avoid bulbs with mould, which may appear as white or grey fuzzy patches. Additionally, look out for any discolouration or spots that might hint at disease.

Integrity Check

A bulb that’s broken or has significant peeling layers might not perform well once planted. It could be more vulnerable to disease and pests.


A rotting bulb can sometimes emit an off-putting, musty odour. Trust your nose; if it smells off, it’s best to avoid it.

Varieties to Consider

The UK’s unique climate offers gardeners an opportunity to host a delightful range of blossoms come spring. While personal preference plays a role, some bulbs are particularly well-suited to the region.

Daffodils (Narcissus)

These iconic spring flowers, with their cheerful yellow and white hues, are a staple in many British gardens.

They’re hardy and resilient and can even thrive under deciduous trees. If you already have some daffodil bulbs stored, September is a great time to get them in the ground.


Tulips offer a diverse palette of colours, from deep purples to vibrant reds. Though they originally hail from the mountainous regions of Turkey, they’ve found a comfortable home in the UK. For extended blooms, consider planting early, mid, and late-spring varieties.


These are among the earliest bloomers, often poking through the snow to signal spring’s imminent arrival. Their purple, yellow, and white petals can carpet garden beds, lawns, and even woodlands.


A member of the onion family, alliums produce spherical blooms that can add a touch of whimsy and drama to gardens. They’re loved not just for their looks but also for their ability to repel many garden pests.

Bluebells (Hyacinthoides non-scripta)

True bluebells are a sight to behold, often turning woodlands and gardens into a sea of blue in spring. They’re also fragrant, adding another layer of allure to your garden.

Bulbs in Hand
Bulbs in Hand

2. Location, Location, Location

The right location is pivotal for bulbs, akin to the way prime real estate can make or break a business.

Ensuring your bulbs are planted in a site conducive to their needs will give them the best chance to flourish and brighten up your garden come spring.

Sunlight Needs

Sunlight plays a monumental role in photosynthesis; the process plants use to convert light into energy. Too little or too much can stymie a bulb’s growth and flowering potential.

Full Sun Lovers

Most spring bulbs, including tulips and daffodils, yearn for a full sun location, which equates to at least 6 hours of direct sunlight daily.

These bulbs accumulate energy not only for the present year but also for the subsequent one, so ensuring they get enough light is crucial.

Partial Shade Dwellers

Some bulbs, like bluebells and wood anemones, have evolved to flourish under the dappled sunlight of woodlands and forest floors.

For these varieties, a site that receives filtered sunlight or direct sunlight only for part of the day is ideal.


It’s paramount to understand the sunlight requirements of each bulb variety. While general guidelines can be useful, specific bulbs might have unique needs that, when met, can truly allow them to shine.

Soil Drainage

Beneath the surface, the soil’s drainage capabilities can make a world of difference in a bulb’s health and bloom prowess.

The Perils of Waterlogged Soil

Bulbs are essentially storage units packed with nutrients. When they sit in overly wet soil for extended periods, they become susceptible to fungal diseases and rot. This can quickly spell the end for that promising spring bloom.

Assessing Drainage

Before planting, it’s a good idea to do a simple drainage test. Dig a hole about 30cm deep and fill it with water. Let it drain, then refill it.

If the second lot of water hasn’t drained within 3 hours, you may need to amend the soil or consider raised beds.

Improving Drainage

If you’re set on a location but its drainage is suboptimal, consider mixing in organic matter like compost or sand to break up heavy soils and improve water flow.

Alternatively, for a more permanent solution, planting in raised beds or using bulb baskets can elevate bulbs from the wettest parts of the soil.

Tulips in the Flower Bed
Tulips in the Flower Bed

3. Soil Preparation

Much like how a house requires a solid foundation, bulbs demand well-prepared soil to ensure they bloom to their full potential.

This process goes beyond just digging a hole; it involves understanding and enhancing the very medium that will nourish the bulbs throughout their growth.


Tilling or turning over the soil serves a multitude of purposes from aerating the soil to breaking down larger clumps that might impede root growth.

Depth Matters

For bulbs, a depth of 12-16 inches (30-40cm) is ideal. This allows the bulb ample room for its roots to stretch out and anchor itself while accessing the nutrients it needs.

Removing Obstacles

As you till, it’s essential to remove large stones, debris, or roots that could obstruct a bulb’s growth. These obstructions can force roots to grow in suboptimal patterns or even damage the bulb.

Aerating the Earth

Tilling also introduces much-needed air into the soil, ensuring roots can breathe. This process can enhance soil structure, especially in areas where the soil has been compacted over time.


Amendments are to soil what vitamins are to our diet – essential for optimal health and performance.


Well-decomposed compost not only adds vital nutrients to the soil but also improves its texture. It can enhance water retention in sandy soils while aiding drainage in clay-heavy ones.

Furthermore, the microorganisms present in compost can help protect bulbs from certain soil-borne diseases.

Bone Meal

Rich in phosphorus, bone meal (Amazon link – opens in a new tab) promotes strong root development, a crucial stage in a bulb’s lifecycle. While bone meal is a slow-release fertiliser, its effects can be long-lasting. Just ensure it’s mixed well into the soil to prevent attracting animals who might dig up your bulbs.

pH Levels

Most bulbs prefer slightly acidic to neutral soil (pH 6.0 to 7.5). It’s worth doing a pH test, as extreme pH levels can inhibit a bulb’s ability to absorb nutrients.

Amendments like lime (to raise pH) or sulphur (to lower pH) can be used to bring the soil closer to the desired range.

Bulbs Being Planted in a Pot
Bulbs Being Planted in a Pot

4. Spacing Your Bulbs

The placement of bulbs in your garden, specifically the distance between them, plays a crucial role in ensuring a harmonious and eye-catching spring bloom.

Proper spacing not only ensures optimal growth but also defines the overall look of your garden.

Spacing Rules

The general rule of thumb when planting bulbs is to allow for at least the width of a bulb between each one. This guideline ensures that each bulb has enough space to grow without competing for nutrients and water.

However, aesthetics matter too. For gardeners aiming for a lush, densely flowered look, it’s common practice to group multiple bulbs slightly closer together. The key is to ensure that while they are near each other for visual effect, they aren’t touching.

This slight proximity encourages a rich display, but without the bulbs intruding on each other’s space.

Bulbs Being Planted in a Pot
Bulbs Being Planted in a Pot

5. Mulching for Health and Protection

Mulching, often considered a gardener’s best ally, is especially vital for bulbs bracing themselves for the UK’s winter months.

This simple yet effective technique involves placing a protective layer atop the soil, providing a myriad of benefits that ensure the bulbs not only survive but thrive until spring.


The addition of mulch to a bulb bed serves multifaceted purposes:

Weed Suppression

Weeds are notorious for siphoning off essential nutrients and water from the soil. A dense layer of mulch can effectively suppress their growth, ensuring bulbs get all the nourishment they need.

Moisture Conservation

Mulch acts as a natural barrier to the elements, preventing the rapid evaporation of moisture from the soil. This retention ensures bulbs remain hydrated throughout the colder months.

Temperature Regulation

Perhaps the most significant advantage during winter, mulch provides an insulating blanket that shields bulbs from extreme temperature fluctuations. By maintaining a relatively stable soil temperature, bulbs are protected from unexpected frosts that can cause damage.

Material Choices

When considering mulch, the choice of material is paramount, and each option offers unique benefits:

Composted Bark

An excellent choice for its durability and aesthetic appeal, composted bark not only protects the soil but as it decomposes, it also introduces organic matter, enriching the soil.


Made from dead and decomposing leaves, this mulch offers a lightweight, nutrient-rich covering. As it breaks down, it imparts essential minerals back into the soil.

Pine Needles

Particularly favoured for bulbs that prefer slightly acidic conditions, pine needles are lightweight, allowing for good airflow while also adding a gentle touch of acidity to the soil as they decompose.

Bark Mulch Around Shrub
Bark Mulch Around Shrub

6. Ongoing Care and Patience

Planting bulbs is a labour of love, with gardeners investing their hopes in those buried treasures, awaiting their glorious spring debut. While the bulbs are now underground, safeguarded from many external threats, the process doesn’t end with planting.

A touch of ongoing care, paired with a healthy dose of patience, is the formula for a flourishing garden.

Watering Regime

Water is a lifeline for plants, but when it comes to bulbs during the winter months, moderation is key. The combination of cold temperatures and excessive moisture can be detrimental, making bulbs susceptible to rot.

Winter Months

If the winter season is particularly wet, it’s wise to reduce additional watering. Bulbs have a natural reservoir of moisture, which they utilise for initial growth. Only during prolonged dry spells should you consider watering, and even then, it should be minimal.

Natural Rainfall

In regions with heavy rainfall, gardeners should be especially cautious. Good drainage, as discussed earlier, becomes paramount. Any additional watering can exacerbate the risk of waterlogged conditions, detrimental to bulbs.

Nutrient Boost

As the first green shoots pierce the soil, signalling the arrival of spring, it’s an opportune moment to consider supplementary nutrition.

Balanced Liquid Fertiliser

At the onset of growth, bulbs benefit from a boost of balanced nutrients. Using a liquid fertiliser (Amazon Link – Opens in a new tab) ensures rapid absorption, equipping bulbs with the essential nutrients required for optimal growth.

This nutrition supports both foliage development and, eventually, vibrant flower production.

Bulbs Being Watered
Bulbs Being Watered


September bulb planting is a rewarding investment for any UK gardener. It requires a blend of careful selection, soil preparation, and patience. When spring rolls around, and your garden awakens in a riot of colours, you’ll relish the foresight and effort of your autumnal endeavours.

For those new to bulb planting or specific regional advice, local garden centres and horticultural societies can provide invaluable guidance.

Garden Doctor Trev

Garden Doctor Tips

“Once planted, give a gentle water to settle the soil, but avoid waterlogging!”

“Ensure bulbs are planted pointy side up. If in doubt, plant them on their side!”

“Different bulbs have specific planting depths. Usually, it’s 2-3 times the bulb’s height!”

“Once planted, bulbs require minimal care. Just wait, and come spring, they’ll reward you with vibrant blooms!”

Frequently Asked Questions

Why is September a recommended month for planting bulbs?

September offers a cooler soil temperature, which allows bulbs to establish roots before winter, preparing them for a spring bloom.

How deep should I plant my bulbs?

A general rule is to plant bulbs at a depth of 2-3 times their height, but always refer to specific planting recommendations for each bulb variety.

How can I determine the top and bottom of a bulb?

Typically, the pointed end is the top and should face upwards. If you’re unsure, planting bulbs on their side is a safe bet.

Do I need to water bulbs after planting in September?

Yes, a gentle watering helps settle the soil around bulbs, but avoid waterlogging, especially in regions with heavy autumn rainfall.

Which bulbs are best to plant in September for spring blooms?

Popular choices for September planting include daffodils, tulips, crocuses, alliums, and bluebells.

What type of soil is best for bulbs?

Well-draining soil is crucial. Most bulbs prefer a fertile, loamy soil enriched with compost or well-rotted manure.

Can I plant bulbs in pots in September?

Absolutely! Ensure you have good drainage in the pot and use a quality potting mix. This method is great for patios or balconies.

What if I find my bulbs have mould or seem squishy?

Discard any mouldy or soft bulbs; they are likely diseased or rotting and won’t produce healthy plants.

How do I protect my newly planted bulbs from pests?

Consider using physical barriers like chicken wire or applying natural deterrents such as crushed shells or sharp sand.

Is it too late to plant bulbs after September?

While September is optimal, many bulbs can be planted as late as October or even early November, as long as the ground isn’t frozen. However, the sooner they’re in the ground, the better.

About Me

Hi, I’m Trev and I’ve been growing things since I can remember. When I was younger, I grew up on a farm, so I have always been around plants and animals. After studying horticulture at university, I decided to start my own nursery which I have run now for 25 years. In my spare time, I run this website – which is a resource for people who want to learn more about their gardens.

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