Tomatoes

How do you stop blossom rot on tomatoes?

Is it okay to plant my tomatoes in the same spot as last year? Is this a problem or should I do something to the soil before I plant?

The tomato plants in my greenhouse are now 1.5m tall and are producing tomatoes. Some of the leaves and branches are showing greyish patches and silvery mould like things on stems. What diseases is this and how can I fix it? 

When do I need to feed my tomato plants and what do you recommend? I‘ve heard you have to pick some growths off but not sure what to do and from where. Also, do you have to put anything on them for white flies or bugs that may eat them?

I would to grow tomatoes that don’t need staking, similar to those grown around the Mediterranean. Will I be able to achieve that here in Dunedin?

Can I plant my tomatoes for this year in the same garden spot as I did last year and if so what is the best fertiliser to put in there?

Some of our tomatoes are yellowing on the tips preventing the flowers from forming. Even one or two in the glasshouse are doing the same thing, even preventing the leaves from forming. Can you can help?