"6 to 8 feet" isn't really a tree. Here's a few medium to large shrubs that you can "limb up" to create a multi-trunked tree look; although they'll want to get taller than 8 feet, you can keep them at 8 with creative pruning: Acca (Feijoa) sellowiana PINEAPPLE GUAVA Arbutus unedo 'Compacta' STRAWBERRY TREE Arctostaphylos ÂAustin Griffiths AUSTIN GRIFFITHS MANZANITA Arctostaphylos densiflora ÂHarmony HARMONY MANZANITA Arctostaphylos manzanita ÂDr. Hurd DR. HURD MANZANITA Arctostaphylos pajaroensis ÂParadise PAJARO MANZANITA Banksia ashbyi ASHBYÂS BANKSIA Banksia brownii FEATHER-LEAD BANKSIA Banksia coccinea SCARLET BANKSIA Banksia menziesii RASPBERRY FROST Callistemon citrinus ÂMauve Mist M. M. BOTTLEBRUSH Callistemon citrinus LEMON BOTTLEBRUSH Callistemon phoeniceus LESSER BOTTLEBRUSH Callistemon rigidus STIFF BOTTLEBRUSH Callistemon salignus WHITE BOTTLEBRUSH Cercis occidentalis WESTERN REDBUD Comarostaphylis diversifolia SUMMER HOLLY Cotinus coggygria SMOKETREE Escallonia laevis PINK ESCALLONIA Escallonia x exoniensis ÂBalfouriÂ, ÂFrades HYBRID ESCALLONIA Grevillea asplenifolia FERN-LEAF GREVILLEA Grevillea ÂHoneygemÂ, ÂIvanhoeÂ, ÂLong JohnÂ, ÂPoorinda BlondieÂ, ÂRed HooksÂ, HYBRID GREVILLEA Grevillea hookeriana TOOTHBRUSH GREVILLEA Grevillea olivacea OLIVE-LEAF GREVILLEA Grevillea victoriae ÂMurray Valley Queen M. V. Q. GREVILLEA Hakea arachaeoides SPIDER HAKEA Hakea bucculenta HOT POKERS Hakea francisiana PINK SPIKE HAKEA Hakea laurina SEA URCHIN, PINCUSHION TREE Leptospermum lanigerum WOOLY TEA TREE Leptospermum polygalifolium ÂYarra River RED SPIRE TEA TREE Leptospermum scoparium ÂHelene StrybingÂ, ÂKeatleyiÂ, ÂPink DamaskÂ, ÂPink PearlÂ, NEW ZEALAND TEA TREE Leucospermum reflexum RED ROCKET Melaleuca armillaris FEATHERY MELALEUCA Melaleuca bracteata WHITE CLOUD TREE Melaleuca decussata LILAC MELALEUCA Melaleuca elliptica GRANITE BOTTLEBRUSH Melaleuca ericifolia HEATH BOTTLEBRUSH Melaleuca hypericifolia HILLOCK BUSH Melaleuca nesophila PINK MELALEUCA Pinus contorta contorta SHORE PINE Pittosporum crassifolium KARO Pittosporum eugenioides TARATA Pittosporum tenuifolium KOHUHU, TAWHIWI Prunus illicifolia HOLLYLEAF CHERRY Psidium cattleianum STRAWBERRY GUAVA Regelia velutina BARRENS REGELIA Rhaphiolepis ÂMajestic Beauty (multi) M. B. INDIAN HAWTHORNE Viburnum suspensum SANDANKWA Xylosma congestum SHINY XYLOSMA Joe

There aren't a lot of truly "dwarf trees". You say you don't want a "bush or shrub" but your limit of 15 feet pretty much rules out true trees (which many botanists say start at 20 feet) and leaves you with the opportunity to take a tall-growing shrub and train it to look like a tree. Shrubs trained as such -- single trunk with a crown -- are called "standards". Usually marketed as "patio trees". Here's a few ideas: Acca (Feijoa) sellowiana PINEAPPLE GUAVA Banksia ashbyi ASHBY'S BANKSIA Banksia coccinea SCARLET BANKSIA Ceanothus arboreus 'Blue Mist', 'Cliff Schmidt', 'Thundercloud', 'Trewithen Blue' TREE CEANOTHUS Ceanothus thyrsiflorus 'Snow Flurry' SNOW FLURRY CEANOTHUS Cercocarpus betuloides MOUNTAIN IRONWOOD Comarostaphylis diversifolia SUMMER HOLLY Cotinus coggygria SMOKETREE Escallonia laevis PINK ESCALLONIA Escallonia x exoniensis 'Balfouri', 'Frades' HYBRID ESCALLONIA Grevillea 'Honeygem', 'Ivanhoe', 'Long John', 'Poorinda Blondie', 'Red Hooks' HYBRID GREVILLEA Leptospermum lanigerum WOOLY TEA TREE Leptospermum polygalifolium 'Yarra River' RED SPIRE TEA TREE Melaleuca decussata LILAC MELALEUCA Melaleuca elliptica GRANITE BOTTLEBRUSH Osmanthus fragrans SWEET OLIVE Pittosporum crassifolium KARO Pittosporum eugenioides TARATA Pittosporum tenuifolium KOHUHU, TAWHIWI Psidium cattleianum STRAWBERRY GUAVA Rhaphiolepis 'Majestic Beauty' M. B. INDIAN HAWTHORNE All of these need some work (pruning) to make them look like a tree (single trunk, crown). Some more than others (as already pointed out with Cercis occidentalis). You didn't say why you need it to top out at 15 feet. Are there utility wires or a view from the house or? Joe

wow.. what an amazing colors on your macropedia fuliginosa to bad it only lasted one year (i am definitely trying that kind next year allthough the seeds are not so easy to find i discovered). Ok so the black spots are not good but if it doesnt affect flowering that much i shouldnt worry to much about it. Do you know if the stalks with the flowers on the Kangaroo Paws should also develope in the first year, mine only show the grassy leaves but no stalks yet? Also thanks for the tip on the grevilleas they are beautifull, i will try a few species next year in spring. Sadly i do not have a garden but i have a balcony which is packed to the rafters (i think thats the expression used in Australia :D )with plants and i converted one window in my house into a sort of greenhouse so everything is in pots. I do have the option to plant them out in my mums garden but since our winters are pretty cold most will have to go back inside when it strats freezing. But i am also interested in bonsai so next year a few of the different trees i have will go in the ground to make the nebari grow a bit more. Here are a few pics off the limited space i have...

Perhaps you could have a trip to Mount Annas(Correct Name?) which I beleive has native plants from all over and discover what they do with the WA natives. I thought Kangaroo paw like it a bit damp and sandy. We had a man from Strathmerton,Vic.speak at APS the other night who ripped up his clay fairly deeply, mulched, hilled and swailed, and had good results. Yes it has to do with microclimate and soil . Research to learn about the plants' natural habitat. After all some WA plants do not grow in sand. Don Burke has a good native garden. But Mount Annas National gardens would be your best bet.