Cottage Garden Cosmos Collections

• Product: Cottage Garden Cosmos Collection
• Common name: Cosmos / Cosmea / Mexican Aster
• Type: Half-hardy annual
• Flower form: Mixed (single and double varieties)
• Colour: Mixed – selected by us for cottage garden planting
• Height: Mixed – typically 50–120 cm depending on varieties included
• Flowering period: June–October
• Position: Full sun (minimum 6 hours)
• Soil: Well-drained, ordinary to poor fertility
• Spacing: 30 cm (12 in)
• Good for cutting: Yes
• Sold as: Jumbo plug seedlings, hand-sown by us
• Plant outdoors: After last frost (mid-May in most areas)
• Delivered: Late April to May by next-day courier. Collection from Castle Cary also available

Cottage Garden Cosmos Collection – A Ready-Made Border

This collection is chosen by us to look lovely jumbled together in a border or bubbling out of containers. We select four or more varieties from our range, picking the mix that is looking best at the time of dispatch. We cannot accept requests for specific varieties, and the exact combination varies through the season. What you get is a curated mix that gives you colour, form, and height variation without having to plan it yourself.

Cosmos is October's birth flower, alongside the marigold, symbolising balance and harmony. The association is apt because cosmos is typically at its most floriferous in early autumn, still going strong when most summer annuals have given up. A cottage garden collection planted in May will earn its keep right through to the first frosts in October or November, provided you keep deadheading. In Korea and Japan, mass plantings of cosmos draw thousands of visitors to roadside festivals each autumn. You probably do not need quite that many plants, but the principle is the same: cosmos looks best planted in numbers, and a collection gives you the variety without the planning.

How to Use a Cosmos Collection

The simplest approach is the best. Plant the whole collection in a single drift in a sunny border, spacing the plants 30 cm apart and mixing the varieties randomly. The different heights will sort themselves out, with taller varieties rising above shorter ones, and the mixed colours will create the loose, abundant look that defines a cottage garden. A group of 9–12 cosmos plants makes a good drift. If your collection includes tall varieties (90 cm and above), put support in at planting time. Water regularly in hot weather, especially in the first few weeks. Once established, cosmos are not fussy, but the delicate new roots need protection from drying out in sun and wind.

Cosmos pairs well with other cottage garden favourites. Lavender at the front of a border gives you a blue-purple base. Dahlias behind provide height and overlapping colour. Both share a love of sun and well-drained soil. For a purely cosmos border, browse the individual varieties in our cosmos collection and build your own mix.

The Ashridge Difference

Every cosmos plug we sell is hand-sown and grown at our Somerset nursery. We source fresh seed each year because cosmos does not come true from saved seed. No contract growing, no outside suppliers. Your plants are hardened off before dispatch and arrive as sturdy jumbo plugs ready for planting.

Next-day courier from late April. Our plant guarantee covers anything that arrives damaged or fails to establish. We are a small nursery and when you ring us you speak to the people who grew your plants.

Frequently Asked Questions

Which varieties are in the Cottage Garden Cosmos Collection?

We select from our full range of cosmos varieties, choosing the four or more that are looking strongest at the time of dispatch. The mix varies through the season and year to year, so we cannot guarantee specific varieties. The pictures on the product page are examples only. This is part of the appeal: you get a selection we are proud of, curated by the people who grew the plants.

How tall will my cosmos collection grow?

Height varies depending on which varieties are included. Some, like the Sonatas, stay at 50–60 cm. Others, like the Sensation types, can reach 120 cm or more. Space all plants 30 cm apart and put support in for any that grow above 60 cm. For full growing advice including staking methods, see our cosmos growing guide.

Can I grow a cosmos collection in pots?

Yes, though results depend on which varieties arrive. Compact varieties like the Sonatas are ideal for containers. Taller varieties will need a large pot (10 litres minimum) and support. If you specifically want cosmos for containers, consider ordering individual compact varieties from our range. For full container advice, see our guide to growing cosmos in pots.

When can I plant out my cosmos collection?

After the last frost, which in most of the UK means mid to late May. Cosmos are half-hardy and will not tolerate cold nights. If a late frost threatens after planting, cover the plants overnight with fleece. In the south you can sometimes risk mid-May; in the north and Scotland, leave it until early June.

Is a cosmos collection a good gift?

Cosmos is October's birth flower, symbolising balance and harmony, so a collection makes a thoughtful birthday gift for anyone born that month. More practically, it is a gift that works for gardeners of any experience level. Cosmos are easy to grow, flower all summer, and need nothing more than sun, water, and regular deadheading. A collection gives the recipient a ready-made colour scheme without any planning required.