Linda do you mean the
Gordon Rowley's book on Crassula, there isn't any one book on "Jades" There are several, Crassulaceae is the larges genus of Succulents, including many species, subspecies, and varieties from all over the world. He writes it so all of us can understand the book, it is not just a picture book. You almost need a class in how to understand the book. Check into Jacobsens Dictionary, very old book but very accurate, and Dr.Toelkins book which is just on the subject of Crassula, but more scholarly, very few pictues, all line drawings, no photos, and other speciality books, that may have just a chapter on the subject.
Don't give up, it just takes a little time to learn. I notice the you live in a area of low temps. If you need help I'll be here to help you. Norma

Hi Norma,
thank you for responding and the info, I am always looking for a good plant book....
I hope I can keep my jades going and doing well over the winter....I think it is very important to keep the water down...thanks for any and all info....linda

Crassula can take low temperatures no problem at all if kept fairly dry. The are winter growers, for the most part of the genus. When you say 'Jade' are you referring to all Crassula, or just Crassula ovata. In the front of introduction pages to each genus or species is the most important. Most of them in the genus all need the same water, fertilier, air,
soil, temperatures as the rest, so if you read one you just about have it covred, C. streyi is different, and a few more, there are in bulb species in the genus, but very difficult if not impossible to find at this time. Linda you are so right about keeping the water down. The don't like wet feet and cold. When they are flowering that is their dormant time here. The start to grow again in the spring. usually they are winter growing growing the heads to flowr in December here, and June in Africa. It will still depend where did they grew in their native country. The flower on the tips of new growth. Pincning out the new growth will make them bushy, and thicken up the trunk of the plant. The trunk should be a single thick trunk and not multible branched. Norma