The best time to divide hostas is in early spring, just as the new shoots, known as eyes, push through the soil. In the UK that is usually March to April. You can also divide them in early autumn, around September, once the heat of summer has passed.
Dividing is easy, it keeps plants healthy, and it is the quickest way to turn one hosta into several. Here is how and when to do it.
Why divide hostas
Over time a hosta forms a dense clump that can become congested and less vigorous in the centre. Dividing every three to five years rejuvenates the plant, keeps it to a manageable size, and gives you free plants to spread around the garden or share. If your hosta has outgrown its spot or is looking tired in the middle, it is ready. Hostas are among the best plants for shade and woodland, so most gardens have room for a few more.
Spring is best
Early spring is the ideal moment because you can see the emerging eyes, so you know exactly where to make your cuts, and the plant has the whole growing season ahead to settle in. Divide before the leaves have fully unfurled, when the shoots are just a few centimetres tall.
Autumn is a good alternative
If you miss the spring window, September works well too. The soil is still warm, which encourages roots to establish before winter. Aim to divide at least six weeks before the first hard frosts.
How to divide a hosta
- Lift the whole clump with a garden fork, getting well under the roots.
- Shake or wash off enough soil to see the crown and the eyes.
- Split the clump into sections, each with several eyes and a good share of roots. Use two forks back to back, a spade, or an old knife for tough crowns.
- Replant the divisions at the same depth as before, water in well, and keep them moist while they establish. Divisions also settle happily into containers, so they are ideal plants for pots and patios.
Newly divided hostas can look a little sad for a week or two, but they bounce back quickly. Keep them well watered and out of harsh sun while they recover.
Looking to add more? Browse our full range of hostas, from bold blues to bright golds and crisp variegated forms, and pair them with hardy ferns for a lush, layered shady border.