Congratulations on your new home!* I hope you will be happy there.***:)* Insect pests will often attack stressed plants.* Could it be possible that these were more stressed then the others?* They may have even been stressed in the nursery before your purchase and the delayed effects are showing up now.* It's also best to water in the morning instead of the evening.* Watering in the evening can lead to fungal problems.* Watering in the morning will allow your plants to be better hydrated before the heat of the day.*
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.