Perhaps if you rub the leaves on your person/clothes but not if the plants are just around your yard.

FataMorgana

Yeah, doesn't do a thing for me. That Lemon Eucalyptus works as a spray for me, but it's extremely stinky, as eucalyptus usually is.

It does help, but you need to keep disturbing the leaves in some way. You either crush the leaves, or tread on them, or just brush up against them - so put plants along pathways to ensure they are frequently rubbed against as people walk along. Most lemon-y herb work in the same way - lemongrass, lemon-scented geranium (pelargonium), lemon basil, lemon verbena etc. The best plant of all to get is a close relative of lemongrass, Citronella Grass (Cymbopogon nargus). It's the oil from that plant which is used in anti-mozzie candles.

Lemon Balm is very effective, however, in treating insect bites. Just rub on a leaf or two to ease itching.

Rosey, you don't have to plant it everywhere--place one pot of it in a fertile area with sufficient moisture and it will seed itself all over the place.

It likes a bit of shade.

At my house, all of the mosquitoes can be found around the Lemon Balm.

At my house I haven't been able to tell since the city fogs us every Wednesday during skeeter season! I'm sure they'll be starting up again soon...good grief.

Avon sells a repellent wipe which is easy to use and so much more pleasant than DEET which I hate.
Best cure for mosquitoes are bats.