PACHYSANDRA TERMINALIS.
Low growing evergreen spreading once established and capable of making dense dark ground cover in shade. Fairly insignificant white flowers in spring. 8” x indefinite. Z6.

 PEROVSKIA ‘BLUE SPIRE’.
Delicate upright grey-white stems clothed in silver -grey leaves. 12” spikes of small tubular blue flowers in late summer and early autumn. 3ft x 2ft. Z7.

 PHILADELPHUS CORONARIUS.
The original ‘Mock-Orange’, retaining the almost pure white blossom, and rich fragrance.  A large dense bush, very hardy and drought resistant. 8ft x 8ft. Z6. 

PHILADELPHUS CORONARIUS AUREUS.
Golden leaved form of the above. The flowers are less significant but it is a compact shrub whose foliage will brighten a dark corner. 4ft x 4ft. Z6. 

PHILADELPHUS ‘BELLE ETOILE’.
A smaller growing hybrid. 2” flowers white with a pale purple centre, strongly scented, late spring and early summer. 4ft x 6ft. Z7.

 PHILADELPHUS ‘MANTEAU D’ ERMINE’.
A bushy compact dwarf, wider than high smothered in highly scented double flowers in early and midsummer 2ft x 4ft. Z7. 

PHILADELPHUS MICROPHYLLUS.
A compact upright little shrub with neat small foliage, densely covered in  very fragrant pineapple scented flowers in early and midsummer. 3ft x 3ft. Z7. 

PHYSOCARPUS OPULIFOLIUS ‘DIABLO’/’LUTEUS’.
Useful background foliage shrubs.  ‘Luteus has bright yellow young leaves, and really lights up the garden in spring. ‘Diablo’ has dark red foliage. Both have small white flowers ººin early summer, and peeling bark. Reputed to be hardy to about -45ºC. 5ft x 5ft. Z3. 

PIPTANTHUS NEPALENSIS.
Also known as ‘laburnifolius’ and bears some similarity to a laburnum, but grows as a bush, has shinier evergreen leaves and the flower spikes in May are erect rather than drooping. The seeds are not toxic. It is hardy to about -7C  and requires a sunny sheltered spot.  6ft x 6ft. Z8 borderline.