Blues

To garden with an Oudolf-esque plant like Veronicastrum, it is not necessary to turn your outdoor space into a prairie: you are allowed to keep your flower beds. Naturalistic planting travels well, and Veronicastrum holds its own in a formal border as well as in the middle of a lawn which has turned into a meadow.

Gardeners are often looking for good solid perennials that will have attractive flowers, be easy to take care of, grow nicely but not take over the garden. One group of plants that should be considered is the Veronicas. They provide some of the clearest, truest blues in the perennial border.

Veronica longifolia prefers a position in sun or part shade in moist well-drained soil. The sophisticated blue spires bloom in midsummer and last for several months. They make a strong vertical statement and are an excellent contrast to more traditional flowers shapes when positioned at the front of the border.

“Imagination’ is a verbena cultivar that is noted for its profuse bloom of violet-blue flowers, its spreading-trailing stems and its deeply cut foliage. A heat and drought tolerant plant, easily grown it performs well in hanging baskets and containers in full sun.

Ranging from pale baby blue to deep midnight shades and growing to an average height of 70cm (28in), this mix of annual flowers is ideal for the garden and the vase. Blue flowers are associated with serenity and calm - plant them in spring and then tell me that your pulse rate slows just a little bit!

The Fama series is well known for its particularly large flowers that are held on long, strong stems. Beloved by flower arrangers, they are considered to be best strain for cutting. This perennial form of Scabiosa are very easy to grow and will flower in their first year from an early sowing.

'Fama' is a most elegant flower. With long stems and intense blue blooms, it is the largest flowering and most uniform strain of the Blue Pincushion. They mature into dense tufts of lance shaped, grey-green leaves from which arise a beautiful display of intense lilac-blue flowers each with a silvery centre.

Boasting the most desirable of deep blue flowers, Scabiosa ‘Oxford Blue’ is a reselected form that stands out from other varieties. The large, domed, dark centred cushions with contrasting white 'pins', bob atop strong stems. A prodigious bloomer, they will supply you with excellent cut flowers.

Salvia x superba 'Blue Queen' is one of the finest Salvias we know. This plant is a spectacular source of dark, intense colour and narrow, vertical form. Masses of pencil-thin, vibrantly colourful bloom spires, so densely set that they present a solid wall of colour in the border.

Salvia verticillata 'Purple Fairy Tale' is a spectacular first year flowering perennial. The irresistible deep purple petals gather like raindrops in tiered pools to form whorled flowers. Easy to grow, it will begin to bloom just a couple of months after sowing. The plant flowers abundantly and continues right through to September

This hardy biennial Sage has been grown in almost every botanical sanctuary in human history and has many plus points: it grows well in poor soil resists slugs and other beasties, and doesn’t slump or need staking. It copes well in sun or light shade and the blooms are a magnet for bees and butterflies.

Salvia patens is undoubtedly one of the very best blue flowering plants, the large, double-lipped blossoms are one of the truest blues found in nature. 'Blue Angel' is one of the smallest of the 'Gentian Sages', there is little else that can compete with the richness of its colour.

Salvia farinacea ‘Fairy Queen’ is an attractive new variety that bears multiple spikes of bicolour blue and white flowers on dark distinctive flower stems from June to October. With a bushy, compact habit and thick stems. A small white spot on each sapphire blue flower creates the illusion of fairy dust.

Awarded a Fleuroselect Medal for striking colour, plant habit, and flowering performance, Penstemon barbatus 'Twizzle Blue' is a first year flowering perennial that will add height and high-impact colour to the border, giving superb flowering performance from mid to late summer.

Nepeta ‘Dark Blue Panther’ is the dark blue flowered variety and sister to 'Pink Panther' and the beautiful white 'Snow' Panther. This award winning variety starts to flower just 15 weeks after sowing and can be can be grown as an annual or as a flowering perennial.

The much-loved, blue Forget-me-nots have the ability to stimulate nostalgic memories. They are a wonderful ground cover for a shady area, although they will also grow in full sun. They are easy to grow and if left alone, will create a lovely blue blanket of flowers.