There are hundreds of NZ plants that are suitable for landscaping the ornamental garden. The feature the gardener finds useful is usually leaf shape and flower structure. Below is a list of plants that Bushman's friend recommends. The particular growing requirements depend on where in NZ the plants are to be grown, the tastes of the gardener and the requirements of the site or garden plan.
For help and guidance contact an experienced landscaping firm or gardener. To purchase seeds contact

Ground covers or plants less than 1 metre tall
Pratia angulata
Fuschia procumbens
Coprosma rhamnioides
Cordyline pumilio
Metrosideros fulgens
Arthropodium cirrhatum
Elatostema rugosa damp spots only
Blechnum capense
Blechnum discolour
Carex spp.
Phormium cookianum
Hebe diosmifolia and varieties
Chinocloa flavescens
Libertia perigrinans
Scleranthus biflorus
Doodia media

Coastal gardens shrubs or small trees
Myoporum laetum
Pseudopanax lessonii
Parsonia bruoniana
Coprosma repens
Coprosma lucida
Hebe speciosa and varieties
Hedycarya arborea
Melicope ternate
Alseuosmia banksii or macrophylla
Grisilinea lucida
Hoheria populnea

Sheltered gardens shrubs or small trees
Pseudopanax laetus
Brachyglottis repana
Macropiper excelsa
Hebe stricta and varieties
Melicytus macrophyllus
Pseudopanax crassifolius
Lophomyrtus bullata
Melicope simplex

Coastal specimen trees
Metrosideros excelsa
Entelea arborescens
Meryta sinclarii
Pittosporum umbellatum
Planchonella costata

General trees
Ackama rosaefolia
Alectryon excelsa
Aristotelia serrata
Vitex lucens
Toronea toru
Cordyline australis
Pittosporum eugenoides
Sophora microphylla
Cyathea dealbata
Cyathea medullaris

Climbers
Clematis paniculata
Tecomanthe speciosa

Of course there are many other options. Each ecological district will have its own requirements. However these are the plants I particularly like and they represent many of the botanical features and special form of the NZ flora.

For more information and inspiration I suggest landscaping with NZ native grasses or one of the following books on gardening with native plants.