Citrus do not like other plants planted in their pots. Citrus need a fairly large amount of nitrogen, so they do not do well sharing nutrients. And, there is no scientific basis for companion plantings. There is some scientific evidence with regard to intercropping, and some evidence that certain plants can confuse or fend off certain types of insects, but in a house, and not in the ground - I doubt having nasturtiums would benefit citrus. You'd have to grow them in pots near the citrus outside, as they will not do well inside during the winter I doubt it would benefit you during the winter, but might possibly fend off "hitchikers" during the spring, summer and early fall months, when your citrus can be outside. And, not sure if there is any scientific evidence that nasturtiums fend off any particular insects, but you might want to do a little research to see. There is a tremendous amount of pseudo-science around "companion planting", so be sure you're looking as some good, factual evidence.

Patty S.

Here is a link that might be useful: The Myth of Companion Planting

Thanks Patty! I have a greenhouse setting and the trees are planted in-ground. I plan on experimenting with garlic and onions next year to see the effect on citrus insect pests. I'll be sure to report back.

That would be interesting, cdevoe. I would do some serious research from some of the ag schools, to see what truly might work as inter-cropping for you. Unfortunately, most of the info out there is more wishful thinking, than based on scientific fact. So, look for reputable sources to see what plants might produce chemicals that are natural deterrents to certain insects. There IS scientific fact and research that backs that up, you'll just have to do some checking to see. And, to see if garlic or onions produce those chemicals, and if those chemical repel the insects you're trying to discourage.

Patty S.

I have 3 citrus trees in pots on my patio. Last year I had a terrible problem with leafminers. My local nursery suggested I plant sage in the pots. Don't know if it worked, but I haven't seen another leaf miner.

When I take my citrus in for the winter I plant other plants that will fill in and use water so my, trees can be water every week with out soaking the roots. Feeding can be done through the foliage. This way the cooler soil temperature does not rot the roots