Ficus benjamina trees in the summer.
French Tarragon can't be grown from seed, I have heard that it will revert back to the Russian Tarragon. I take cuttings of these plants and propagate by putting Rootone on the end of the cutting and putting in a light potting mix. After they have taken root I transfer them to a mix of one part potting mix, peat, coarse sand and just a little bone meal. This is the same mix I use for any herb I grow in pots. I also use terracotta pots, this helps to keep the soil from staying too wet, which Tarragon does not like!