Philadelphus are natives of North America and are named for the city of Philadelphia
Philadelphus is a shrub in full flower now. In July the branches of this hardy, deciduous shrub are weighed down with sprays of fragrant flowers that are white with a pale cerise blush at the base of each petal.
The shrub is easily grown in any type of well-drained soil in sun or partial shade. An occasional mulch of leaf-mould or rotted compost is beneficial. After flowering cut back the shoots that flowered, on established plants cut back about one-quarter of the old shoots to the base to promote new replacement growth.
Philadelphus coronarius ‘Aureus’ has golden yellow leaves which needs shade from the sun to prevent the leaves burning.
Philadelphus coronarius ‘Variegatus’ has leaves with broad white margins. Philadelphus species vary in size, most are medium-sized shrubs that grow about 10 feet tall. Philadelphus ‘Beauclerk’ is a slightly arching shrub that grows to 8 feet tall and produces white flowers with a slight pink-flush centre.
Herbaceous plant of the week
The outstanding feature of eryngiums is the unusual metallic-looking flowers they produce. Eryngium bourgatii grows 18 inches tall, produces blue branching stems with blue cone-shaped flowers with silver bracts. Most eryngiums are native to the dry, rocky coastal areas of Europe and North Africa where they produce large tap roots. Most eryngiums need sunny, free-draining soil, they are ideal for stoney or gravel beds. Plant between autumn and spring, cut flower stems down to ground level in late winter.
Bulb of the week
Triteleia is a bulb in flower now producing masses of purple-blue flowers. The plant is grown for its funnel shaped flowers which are produced on leafless stems, the leaves usually die away by flowering time. The plant is suitable for a warm sunny bed or herbaceous bed, it will not survive severe frost. Plant the bulbs in the autumn, 3 inches deep, in a light sandy fertile soil in full sun.
Peppers, chillies and aubergines are not the easiest or most economical of crops to grow but the fruits are beautiful when they ripen and the range of flavors are most rewarding. They are relatives of the tomato and need similar conditions so grow them in the greenhouse. The seeds are sown in spring and transplanted into 9 inch pots or grower bags. Support each plant with a 3 foot cane and tie the plants onto the cane with a string. Apply a liquid fertiliser every two weeks after the first fruits appear. Green peppers are ready for picking in late summer or you can wait until they ripen to red. ‘Jumbo Sweet’is an F1 hybrid that produces giant peppers. ‘Inferno’ is a moderately hot chilli that produces a big crop over a long season. Keep an eye out for aphids, red spider mites and whitefly.
Jobs for the week
Prune wisteria by cutting back all the whippy growth made during the summer to within five or six buds of the main stems. This encourages the formation of flower buds for flowering next year. These shoots are shortened again in winter.
The seeds of biennials such as wallflowers and sweet William can be sown now to produce flowers next year.