Sensation Purity Cosmos Seedling Plants

Cosmos Sensation Purity

Cosmos bipinnatus Sensation Purity is probably the best of the white-flowered Cosmos which is why it was the first choice in our range of ready to plant cosmos seedlings.

It really is a fantastic plant. Like most of its family, you could be forgiven for growing Cosmos Purity for its foliage alone - fresh green and finely cut - almost like extra lush Dill. It is a much more powerful plant though producing a staggering number of large, white, daisy-like flowers from late spring through to autumn. It looks at its best in a mass planting - about a dozen is a good number, but it also a makes a very good subject in a container along with one of the larger Verbenas and/or some Lavender plus a silver foliage plant such as Cineraria, and maybe some white lobelia... or Bacopa...

The trick with Cosmos Purity is to keep it cut and/or dead-headed. As long as it does not run to seed, a single plant can produce well over 100 flowers in a summer which for its - and their - size has to make it one of the most floriferous plants there is. Cutting should not be a problem, it is a superb cut flower and almost trouble free. Really, no garden should be without it.

Cosmos Sensation Purity Features:

• Half-hardy Annual
• Colour: White
• Height: 70-90 cms
• Planting Months: April - June/July
• Flowering: May - September/October
• Plant Spacing: 25-35 cms

Plant Cosmos Purity seedlings in well prepared, moist soil that ideally was enriched with a little organic matter the previous autumn. Not too much as all Cosmos flower better if the soil is not overly rich. Water well after planting and for at least a few days after that that just to make sure they establish well.

Purity also grows very well in containers but remember that it can reach 100 cms in ideal conditions so we would suggest using pot sizes of at least 5 Litres and preferably a bit more. Any general purpose compost will do here.

The main requirements are that your plants have enough light and water - they grow very fast and flower hugely through summer so moisture is important. They can cope with a little shade but flower better in full sun. At a guess, they need a minimum of 4 hours direct light a day, but they do better with more.

Because you are buying seedlings, you can plant your cosmos into their final flowering positions immediately. Space your plants 25-35 cm apart and (in a bed) plant them in drifts of 12-15 plants. They will either need a 90 cms bamboo per plant (which should be pushed in about 30 cms deep and about 5 cm from a plant) or a support made of twine or pea/bean netting. This should be stretched between canes about 30-40 cms above ground level and the cosmos can then grow through it. It is not pretty at first but the plants disguise it very quickly and it is an effective solution. Just don't plant a group that is so big you can't reach the middle...

As flowers develop cut them or dead head when they are over and Purity will carry on flowering all summer long. A well-grown plant can quite literally produce a hundred flowers or so in a season.

To maintain flower quality and size, you can use a high potash and phosphate fertiliser every fortnight throughout summer Home-made comfrey tea is perfect or one of the specialised tomato fertilisers will do very well.