May

A profusion of cut petals in burgundy to almost black makes 'Black Swan' a must-have flower for cottage gardens. The petals are very deeply pinnately-divided which makes it entirely different from the others, and that is the source of the variant name, laciniatum, from the Latin meaning meaning 'slashed' or 'torn into divisions'.

Papaver somniferum ‘Hungarian Blue’ is a stunning new deep violet poppy that will bring rich colour and a touch of sophistication to your planting schemes all summer long. A hardy annual that is very easy to grow, plant it outside in drifts where it will cover a large area with its beautiful blooms.

Grown primarily for its decorative seed pods, Papaver somniferum ‘The Giant’ provides huge blooms in a multitude of colours, each with satiny petals which give way to possibly the largest of all poppy pods. Florists the world over, use the giant pods in floral decorations, either fresh with late summer flowers, or when dried.

The Bees and Butterflies Mix of flowers is a carefully chosen range of over 30 annual flowers that are rich in both nectar and pollen that both bees and butterflies adore. They will flower within six to eight weeks and provide you with pleasure throughout the summer.

Russian Sage is one of the great garden plants of all time, but if you've been frustrated by their floppy nature, this new variety will be a welcome addition. Growing to about 60 to 75cm tall, Perovskia atriplicifolia 'Taiga' is also the first Russian sage available as a first year flowering perennial.

Tall garden phlox are a beauty to behold, the large, dense flower clusters, produced in abundance during summer. Phlox Hybrids Mix is a perennial, cultivated strain. The colours are wonderful, the sweetly fragrant, evening scent is captivating and they are very easy to grow.

The physostegia has prolific dazzling tubular flower spikes which are arranged on distinctly square stems. This oddly named perennial is perfect for the middle of a mixed or herbaceous border. The flowers are on swivels that can be bent right or left on the stem - a useful feature for floral displays.

The white form of the lovely Jacobs Ladder, named after the slender, fresh green leaflets arranged like the rungs of a ladder. Blooming in late spring to early summer, the bright foliage and white flowers will brighten shady locations. Both the flowers and the attractive ferny foliage are excellent for cutting.

Collected at altitude in Japan and introduced in 2006, Polemonium yezoense 'Purple Rain' is one of the best new introductions in recent years. With bronze-purple lacy foliage, dark stems and violet-blue flowers, it is the darkest flower form of Polemonium available.

Prunella vulgaris is an interesting and quite beautiful little wildflower plant. The plants produce pretty blue-violet flowers in summer, the flowers freely produce nectar and are highly attractive to bees. If you’re looking for something to add to a meadow garden, or something for those shady areas this is the plant for you.

This attractive plant will be equally at home in the flower border or keeping company with the sage and thyme in your herb garden. Delightfully aromatic, the floral-peppermint scent is subtly different from other mints. Mountain mint is a great nectar plant, its honey is much sought after.

Ricinus communis 'Carmencita' is an outstanding new variety with shiny dark brown foliage. The palmate leaves have deeply incised lobes and grow 30 to 75cm (12 to 30in) across. The plants have red stems and in late summer clusters of bright red blooms are followed by stunning scarlet seeds pods.

Considered by many gardeners as the most complete border flower, when Rudbeckia ‘Cherry Brandy’ was first introduced, it took the plant world by storm. This stunning cultivar is the world’s first red Rudbeckia, it produces a mass of spectacular cherry-coloured blooms all summer long.

Rudbeckia hirta 'Denver Daisy' has large, golden daisies with chocolate brown centres and marks at the base of each petal. Growing to around 75cm (30in) tall, this lovely variety performs well, is exceptionally heat tolerant and blooms for a long time in summer.

The heavy blooming ‘Irish Eyes’ has fantastic bright yellow and gold daisies with emerald green eyes, a far cry from your typical black-eyed Susan. It is easy to grow, great for cutting and offers lots of blooms in the heat of summer. This popular ornamental is at home in wildlife gardens, cutting gardens and mixed borders.

Rudbeckia hirta ‘Large Flowered Mix’ produces a spectacular mix of giant double and semi-double daisy-like flowers that are carried on long stems and are perfect for cutting. In a spectacular mix of warm colours including golden-yellow, orange, bronze and mahogany, they flower profusely all summer long.

Rudbeckia hirta ‘Maya’ is a fabulous award winning variety, bearing beautifully doubled golden daisies with petals so dense they almost look like pincushions. Golden yellow, with a kiss in the centre — almost like a Zinnia in appearance. An outstanding cut flower and wonderful in mixed containers.

Semi-double and double velvety blooms in subtle shades of pale cappuccino, deep caramel, copper and dusty raspberry and everything in between. Rudbeckia 'Sahara' is one of the most spectacular blooms in the late summer border, coming to its peak just as others are starting to fade.