Dave T,

'Salade mesclun' just means 'mixed salad', usually harvested when small. Collect the seeds of varieties you like, mix them together and sow. Arugula would gag a goat.

Try winter sowing your herbs: put in containers with drainage in late November or December, and leave them out in the weather all winter (out of reach of slugs). They will sprout when it's time.
(for more on winter sowing, see Winter Sowing.

To help resist tomato blight, plant far enough apart for good all-around air circulation, and prune off all stems within 12" of the ground. Mulch with straw, hay, leaves or weeds to prevent soil splashing onto the leaves.

Insecticides are less useful every year, as the bugs quickly develop resistance. Use organic fertilizer (look for OMRI on label), it's more complete with 16 nutrients and trace minerals, most chemical fertilizers just provide three (NPK). Healthy plants resist disease and pests better than struggling plants.

Consider chickens, they love Japanese beetles.

Sue