This list shows that you can have a great range of trees, shrubs and groundcovers in limestone soils, without soil preparation.
Acacia lasiocarpa (prostrate)
Hemiandra pungens alba
Adenanthos cuneatus “Coral Carpet” pbr
Hemiandra pungens purpurea
Calothamnus “Little Ripper” pbr
Kennedia coccinea “Coastal Carpet” pbr
Chorizema varium
Kennedia prostrata
Eremophila glabra “Carramar Carpet” Syn. “Kalbarri Carpet”
Rhagodia baccata
Grevillea “Ellabella” pbr
Scaevola anchusifolia
Grevillea olivacea hybrid "Lemon Supreme"
Scaevola crassifolia “Flat Fred” pbr
Grevillea preissii ‘Mini Marvel’
Grevillea thelemanniana
Acacia lasiocarpa
Lechenaultia linarioides
Boronia crenulata “Pink Passion”
Melaleuca pentagona “Little Penta” pbr
Conostylis candicans
Olearia axillaris “Little Smokie” pbr
Grevillea preissii “Sea Spray”
Westringia dampierii "Little Dampiera" pbr
Acacia cyclops
Grevillea preissii “Mini Marvel”
Acacia pulchella
Acacia rostellifera
Hardenbergia comptoniana (Pink)
Acacia saligna
Hardenbergia comptoniana (Purple)
Acacia spathulifolia
Hardenbergia comptoniana (White)
Acacia truncata
Leucophyta brownii
Adenanthos cuneatus
Melaleuca huegelii
Adenanthos sericeus “Pencil Perfect”
Melaleuca ringens “Coastal Column” pbr
Banksia ashbyii “Carnarvon Candles”
Melaleuca systena
Banksia menziesii
Olearia axillaris “Compact”
Banksia prionotes “Little Kalbarri Candles”
Pimelea ferruginea “Bonne Petite”
Boronia alata
Pimelea ferruginea “Shell Pink”
Calothamnus “Clean and Green” pbr
Scaevola crassifolia “Compact”
Grevillea "Ellabella" pbr
Scaevola nitida (blue)
Grevillea olivacea hybrid "Red Sunset"
Scaevola thesioides
Grevillea olivacea red
Templetonia retusa
Grevillea olivacea yellow
Xanthorrea preissii
Grevillea pinaster (prostrate form)
Agonis flexuosa “Peppermint Tree”
Eucalyptus foecunda
Banksia ashbyi
Eucalyptus gomphocephala “Tuart”
Eucalyptus torquata “Coral Gum”
Banksia prionotes
Eucalyptus woodwardii
Callitris preissii “Rottnest Pine”
Grevillea crithmifolia "Green Carpet"
Eucalyptus erythrocorys
Melaleuca lanceolata