Hi Pennypincher - almost half hijacked your thread earlier so here's my experience with the old weed and feed stuff:
- I used the granules last 2 years and got a patchy effect - found it hard to distribute them evenly. Yes, you need quite a bit of the stuff to fall on the weeds and it makes them shoot up and eventually die off.
- my neighbour, who has a beautiful garden, uses a weed and feed that is disolved in water and distributed with a watering can - therefore the spread is more even and his lawn looks like a bowling green!
- another neighbour uses the agricultural pellets which are much cheaper than the weed and feed you can get at the DIY store - they're called 20-80-10 or something like that. His lawn is also weed free and lush and green. However, he buggers off to Spain for 6 months every year and leaves me to look after his lawn and it's a nightmare to cut! The pellets are, I think, used by farmers to produce silage and the grass is fast-growing, very thick and juicy - I wouldn't recommend it unless you have a tractor to mow the lawn!
I'll ask the neighbour with the bowling green lawn exactly what he uses and will let you know.