Knowing which bulbs to plant in September is essential if you want a spring garden that’s brimming with blooms.
Figuring out when to plant bulbs for spring can be daunting: plant the bulbs too early, and their green shoots will get killed off in the first frost. Leave it too late and the ground will be frozen solid, meaning the bulbs cannot grow and will just rot.
However, as a general rule of thumb, planting bulbs is one of the best jobs to do in the garden in September. ‘Planting bulbs in September will ensure that they can set out roots before the soil gets too damp, which may help protect them against rotting over winter,’ says Helena Jones, gardening expert at Hedges Direct. ‘Apply a layer of mulch to the soil to add protection to your bulbs against frost. Here are some bulbs you can plant in September.’
1. Daffodils
Sunny daffodil bulbs are one of the joys of spring, and September is a great time to plant daffodil bulbs and will reward you with colour in the garden.
With all of these bulbs to plant in September, you need to know how to plant bulbs. ‘Plant daffodil bulbs about 10-15cm deep and 10cm apart in well-drained soil. They thrive in full sun to partial shade,’ advises Craig Wilson, gardening expert and founder of the online gardening retailer, Gardeners Dream. ‘After planting, give them a good drink to help them settle, but avoid overwatering as they don’t like soggy conditions.’
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2. Crocuses
Crocuses are one of the first signs of spring, but planting them in September will ensure blooms in February. Crocuses are a welcome addition to flower bed ideas, but they are also one of the easiest spring bulbs to grow in pots – why not try making a bulb lasagne for a continuous display?
‘If you’re planting in containers, use gritty, well-drained soil in full sunshine, and place somewhere you can view from a window to bring instant cheer during the colder months. Crocuses are one of the best plants for pollinators as the beautiful yellow, white, and purple petals are packed with pollen,’ advises gardening expert Sarah Raven.
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3. Alliums
September is the perfect time to plant allium bulbs, and they’re a must-have in the garden. Not only are alliums statuesque additions to the flower border, but they are also one of the best plants to deter aphids from roses.
‘We recommend planting alliums in the autumn,’ says Josh Novell, gardening expert at Polhill Garden Centre. ‘Alliums like full sun and well-drained soil, and work well when mixed in with other perennials.’
However, if you have missed the September window, alliums can be planted well into October, too.
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4. Snowdrops
Knowing when to plant snowdrop bulbs can seem confusing; however, they are some of the best bulbs to plant in September. It’s also important to know where to plant snowdrops for the best chance of spring blooms.
Learning how to plant snowdrop bulbs is pretty straightforward. ‘Snowdrops need to be planted about 5cm deep and 5-10cm apart. They prefer rich, well-drained soil and do well in partial to full shade. Water them well after planting, then occasionally until they’ve settled in,’ advises Craig Wilson, gardening expert at Gardeners Dream.
There are plenty of pretty snowdrop varieties from which to choose – these are some of our favourites.
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5. Anemone
Spring-flowering anemones are another bulb to plant in September, and will reward you with beautiful blooms between May and July.
‘Always soak the bulbs in water overnight to plump them up before planting anemone,’ advises Julian Palphramand, Head of Plants at British Garden Centres. ‘Prepare the soil by adding compost and grit, as anemones require good drainage. This will improve aeration and moisture retention. We also recommend you add a mulch or leaf mould to maintain soil moisture. Plant the bulbs horizontally, about 8cm deep and 10cm apart.’
One thing to note is that when to plant anemone bulbs depends on the variety –autumn-flowering anemone need to be planted in late spring/early summer.
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6. Muscari
Nicknamed after their clusters of bluebell flowers that resemble a bunch of grapes, Grape Hyacinth, or Muscari, are one of the best bulbs to plant in September.
Best suited to container gardens – these plants have a tendency to spread and colonise – they look beautiful when planted in a terracotta pot and displayed on a patio or windowsill.
If you’re looking to bring life into a darker spot, muscari is a brilliant choice; in fact, they are among the best spring bulbs for shade to plant in September. This is partly because they are among the best bulbs for scent, so pop them somewhere you can enjoy their fragrance.
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7. Amaryllis
If you’re wondering when to plant amaryllis bulbs for Christmas flowers, then look to plant a few in September and then a few in October, to ensure that at least one plant is at peak bloom on Christmas Day.
‘Amaryllis will be in flower 7-10 weeks from planting,’ explains plant expert Sarah Raven. ‘They can be planted anytime from September to January, but I tend to plant them in October for flowering at Christmas or early in the new year.’
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What is the latest to plant bulbs?
October/November is the latest time to plant bulbs – however, September is the ideal time to plant bulbs.
‘Early spring flowering bulbs, such as daffodils, crocus and hyacinths, will bring a welcome early injection of colour to the garden and will need planting before the end of September. For summer-flowering bulbs, such as lilies and alliums, these should be planted in September and October. Tulips are a spring favourite, and can be planted later in the season up until the end of November,’ says the garden experts at Phostrogen.
Not only can you plant bulbs in September, but you should plant bulbs in September for the best chance of spring blooms.
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