I can't think of any off the top of my head, but have a listing somewhere of companion plantings that serve as trap crops for different "bad" bugs and others that attract the gardener's allies. I'll take a look for it tomorrow.

In the meantime, you might want to do a google search for "companion plants"; you'll find there's a wealth of such information from decent sources.

The most floriferous plants in my GH right now are tropical hibiscus. However, they are whitefly magnets. They are one of two plants I use a systemic on in the winter (the other is gardenia). Other winter flowers include costus, plumbago, jasmine.

I don't use any of the traditional GH IPM insects like lacewings, but I have an endless supply of mantis egg cases, and periodically I bring one in the GH. The duranta contracted a nasty case of aphids, but I held off on spraying and the mantids got it nicely under control...just a thought.

The link below is one of the better companion planting charts I have seen.

Here is a link that might be useful: companion planting

Thanks for the comments.

I'm trying to attract ladybugs, lacewings and some wasps. Last year, the wasps ended up getting the aphids. I never saw one of them, they must be very small. What I did see was masses of 'aphid mummies'.

I'll probably end up doing what I did last year, use a spray bottle and knock the aphids off mechanically. I've planted a bunch of amaryllis, paperwhite and daffodil bulbs on a weekly interval scheme, so I may get to enjoy some pretty flowers.

Also, looking at old pictures, I noticed having a huge Kalanchoe bloom 2 years ago, when aphids were less a problem.

In Hawaii I used nasturtiums for an aphid trap to keep from having to spray new growth at my tropical fruit tree nursery. I have started some seed here in Texas in my greenhouse and they are doing fine but are small. No aphids on them yet. So far the only thing that has aphids in my GH are bougenvilla's. Normally you plant nasturtiums as a cool season plant down here so I am still experimenting with the growth and bloom cycles.
Happy Growing David

Speaking of trap crops ... Datura. I have three small plants growing from seeds someone sent me and the one that has begun to flower was covered heavily with aphids, yet not a single aphid on any other plant in the greenhouse! I hit them with a few spritzes of a mixture of water, insecticidal soap and baking soda that I keep on hand and they were history.

>I hit them with a few spritzes of a mixture of water,
>insecticidal soap and baking soda that I keep
>on hand and they were history.

That sounds like a good mix. I relied tap water last year. It just kept the aphids in check, but I enjoyed the game. Squirting every new growth tip with aphids helps me get to know the plants better.