how do get rid of red mights

If you mean red spider mites then with great difficulty unless you can get hold of professional products (dynamec) and these two which are easier to get and a bit cheaper

Pyrethrum 5 EC and SB Plant Invigorator.

Treat and retreat with a miticide on a weekly basis for five weeks. The reason is that the miticide is not effective on mite eggs and you will have to hit the new ones as they hatch until you see no more mites. If the plants are house plants, take them outside for treatment of course. As with all pesticides read the label before use. You would be suprised how many people don't.

Loosestrife, I don't think miticide exists this side of the pond… we have rather more stringent controls than the US on what an amateur gardener can use.

We have ways of beating the stringent controls !!

Dynamec only costs £120. But it will last a good 15 years!!

Provado Ultimate Bug Killer2 - aerosol has an extra ingredient that the concentrate or ready to use hasn't. It says that it will deal with spider mite. I have suffered with red spider mite on cucumbers and Andy Garland on Radio Kent suggested SB Plant Invigorator. Although not 100 per cent, it did improve the situation.