When to plant agapanthus seeds – top tips to get a head start ahead of spring

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It’s never too early to plan ahead when it comes to gardening and with the cold winds of winter beginning to whip through gardens across the country, mapping out your summer garden will make for an even more vibrant display of plants. Agapanthus are easy to grow from seed during spring, but there’s one way you can get a head start with these stunning summer ‘Lily of the Nile’ flowers right now.

When to plant agapanthus seeds

Growing plants from seed requires a lot of preparation to establish seedlings which can later be planted out into your garden.

Agapanthus seeds are best grown through spring and summer, with most blooms working well when planted out between late March and early April.

While this may seem a while away, there is one way you can start planting agapanthus right now for a well-established crop ahead of the spring.

How to plant agapanthus seeds in autumn

As we reach the end of October, it may seem like an odd time to begin planting this sun-loving flamboyant flower.

Despite being somewhat out of season, well-planted agapanthus seeds can thrive with the right care and will offer the most vibrant pink, purple and white blooms throughout your garden as the sun gets higher in Spring.

Agapanthus seeds can be bought in sachets, or you can extract them from their pods from established plants – though you should always dry these out before planting.

Take clusters of the flower from the plant when still ripe – the pods will be green.

Dry the cluster in a pot left in a greenhouse or cool, dry shed until it appears crispy to touch and dull in colour.

Seeds from agapanthus pods can be easily extracted with your hands so be sure to look for the small, black and oval-shaped fragments.

Choose a deep pot to allow for a lot of root growth.

For best results use soil which contains roughly:

  • One-third sterilised topsoil
  • One-third recycled grow bags
  • One-third gritty sand

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Sieve and mix the soil together before filling your clean, empty pot until it is almost full.

Leave a few inches un-filled at the top to allow space for watering.

Sprinkle your agapanthus seeds into your soil-filled pot, making sure they’re not too close together.

Give them a fine coating of leftover soil to cover the seeds.

Use a lolly-stick or plant label to label your pot.

Place in the corner of your greenhouse or in a warm area of your home and leave for a year to allow the plant to establish.

Growing agapanthus indoors

Keep your freshly sown agapanthus seed pots on a south or southwest facing window sill for maximum sunlight if growing indoors.

You can move your potted agapanthus outdoors in the spring after the final frost has arrived but be sure to bring them back indoors again the following autumn before the first frost.

Agapanthus grows well in containers and can even be grown entirely indoors as a houseplant.

How do I know when my agapanthus have established?

After sowing your agapanthus seeds, check in on them monthly to review their progress.

Gardeners’ World says: “When seedlings have strong shoots and roots, knock them out of the tray and separate.

“Pot up seedlings individually into modules or small pots and finish the surface of each pot with grit to retain moisture, keep down weeds and provide drainage around the crown of the plant.”

Agapanthus blooms better when it is slightly root- bound so don’t repot too often.

Divide and repot them every four or five years when the roots are pushing up out of the soil.

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