Poopie I remember the old mob on Gardening Australia used to talk a lot about using ?superphospate? when you plant things because it gives the root growth a really good burst, as well as lots of seaweed liquid stuff because that encourages all the healthy plant enzymes. Perhaps with the zucchini you planted it too early or late...they really don't cope in the cold weather, strictly for spring-summer. I think you're just going to have to wait for the citrus, we planted a mandarine 6 years ago and to our knowledge this will be the first year we'll have fruit off it (I think the tenants didn't water over summer so it's a hardy little thing)