Letting crews over-trim your palms
The carved 'pineapple' look, where healthy green fronds are stripped away, weakens palms, reduces fruit and invites pests. Green fronds are the tree's engine. Instruct any crew to remove only brown and dying fronds and never to cut above the horizontal line of the crown, and be suspicious of anyone who argues.
Buying lush imported plants for a west-facing position
The prettiest plant at the garden centre is often a greenhouse import that has never felt real sun. Placed on a west-facing balcony or bed, it collapses within weeks of warm weather. Ask where stock was grown, favour locally acclimatised and slightly weathered specimens, and match the plant to the exposure rather than to the photo in your head.
Laying new turf straight onto old ground
Paspalum rolls dropped onto compacted, salty or debris-filled ground will green up for a fortnight and then fail in patches. Proper re-turfing includes stripping the old surface, adding a layer of clean sweet soil, levelling, and verifying sprinkler coverage before the first roll goes down. If a quote does not mention soil preparation, it is a quote for a temporary lawn.