I agree, those opportunities are random, even if you get the first one it can take a long time to get the next ones. It must have been beginners luck.
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Carl, here is something you should check out.
There was an update to my game today so of course I installed that. I have been playing for a little bit and I've noticed a few changes and one major one is to gardening.
When I hover over a plant I can see the quality of the fertilizer used on it, like this: "Strength of fertilizer: Outstanding" (that was vampire fish). And when I click on a plant that needs fertilizer I get the option to "Fertilize garden with best fertilizers". I tried that with a Sim who had things like life fruit, garlic and vampire fish in inventory, he used the life fruit on all plants that needed it.
Pretty cool feature if you have plenty of life fruits that is.
Also when I hover over a vegetable or fish in inventory it says something like: "Fertilizer strength: Great".
Oh and when you open the refrigerator or book shelf there's a Take All button which moves everything to the Sims inventory.