Successful s e l e c t i o n of plants for sand dune r e c l a m a t i o n r e q u i r e s a knowledge of t h e m a c r o -and m i c r o e n v i r o n m e n t of plar~ting locations.R e c l a m a t i o n of c o a s t a l dunes in A u s t r a l i a h a s m a i n l y been u n d e r t a k e n in the t e m p e r a t e and M e d i t e r r a n e a n w i n t e r -r a i n f a l l zones of s o u t h e r n A u s t r a l i a , with a v e r a g e annual r a i n f a l l of b e t w e e n 500 m m and 850 ram, and in the s u m m e r -r a i nfail, s u b t r o p i c and t r o p i c zones of e a s t e r n A u s t r a l i a , with a v e r a g e rainfall between 600 and 1,200 ram.The m a i n t r e a t m e n t of inland dunes h a s been in the a g r i c u l t u r a l a r e a of the w i n t e r rainfall zone w h e r e the annual r a i n f a l l is between 250 and 350 m m and t h e s u m m e r s a r e hot (average m a x i m u m daily t e m p e r a t u r e s 32°C) and d r y (potential e v a p o t r a n s p i r a t i o u 125 r a m / m o n t h ) .Coastal dunes a r e e x t r e m e l y low in plant n u t r i e n t s and r a n g e f r o m acid s i l i c e o u s to highly c a l c a r e o u s s a n d s . L a r g e a r e a s of s t a b l e dunes a r e in a d e l i c a t e state of b a l a n c e and r e a d i l y e r o d e if t h e i r p r o t e c t i v e v e g e t a t i v e c o v e r is weakened or r e m o v e d . Dune i n s t a b i l i t y is caused by clearing, cultivation, o v e r g r a z i u g by stock a n d / o r rabbits, fire, and r e c e n t l y by b e a c h m i n i n g f o r t i t a n i u m m i n e r a l s and c o n c e n t r a ted r e c r e a t i o n a l t r a f f i c k i n g by people and t h e i r v e h i c l e s . COASTAL DUNES RECLAMATION.In the w i n t e r -r a i n f a l l zone in s o u t h e r n A u s t r a l i a , the m a i n s t a b i l i z e r used for f r o n t a l dunes is m a r r a m g r a s s , AMMOPHILA ARENARIA, planted vegetatively. In the s u m m e r -r a i n f a l l zone of the e a s t e r n coast, native h a i r y spinifex SPINIFEX HIRSUTUS, e s t a b l i s h e d f r o m seed sown u n d e r brush, is used. Sea wheat AGROPYRON JUNCEUM is planted at the toe of the s e a w a r d face of the f r o n t a l dune in Victoria. P i P g r a s s EHRHARTA VILLOSA h a s also been s u c c e s s f u l as a p r i m a r y s t a b i l i z e r in South and W e s t e r n A u s t r a l i a .The m o s t i m p o r t a n t s e c o n d a r y s t a b i l i z e r s used include Lupins LUPINUS DIGI-TATUS (cv. West A u s t r a l i a n ) , t r e e lupin LUPINUS ARBOREUS, pigfaee CARPO-BROTUS S P P . , coast a c a c i a ACACIA SOPHORAE, and A. CYANOPHYLLA. Bone seed o r bitou bush CHRYSANTHEMOIDES MONILIFERA is also widely u s e d in New South Wales. *) Soil C o n s e r v a t i o n Authority, 378 Cotham Rd, Kew. 3101, Victoria, A u s t r a l i a . Preser~ted at the Sixth International B i o m e t e o r o l o g i c a l C o n g r e s s , Noordwijk, The Netherlands, 3-9 S e p t e m b e r 1972.