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It is not perfect. For instance, its information on shade, water, and pH requirements is sketchy and sometimes conflicts with other sources I've consulted. But it is very good.
In all, this is a far better deal than getting multiple volumes of the Taylor's Guides, although for those who want more information the RHS Dictionary ($800) is more complete and those who want more photos of each plant the Roger Phillips and Martyn Rix series (Random House) is richer.
Perhaps someday soon the RHS Dictionary and the AHS Encyclopedia (which is based on the RHS Encyclopedia) will be available in CD-ROM. Until then, this paper volume has far broader coverage than any CD-ROM collection I've seen so far.
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It teaches you to recognize specific plant forms to which you apply the 9 pruning techniques that cover all bases. This book makes it simple to prune any plant, and the other book will tell you that almost all plants benefit from pruning.
As an example, red-twig (or yellow-twig) dogwood should be pruned by completely taking out the oldest 1/3 of branches each year in late winter. This keeps color strong and the bush uncrowded.
Lavender should have 1/3 of last year's new growth pruned off at end of winter, and you have to start this when the plant is young. (I didn't, and you can kill it by cutting back to hard wood.)
It also tells you the difference among all the types of roses (critical, because some bloom on second-year wood) in a 6-pg section copiously illustrated.
I expect that the new version deals with new plants, but have not seen it.
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I would recomend this book to anyone interested in starting out with orchids. It has lasted me years, without needing another reference.
When I bought my first orchid, I purchased it with an excellent book called "Easy Orchids" by Mimi Luebbermann. The Luebbermann book got me through the first several months (and the first 6 orchids). The Ortho book adds to the excellent information that you obtained with Luebbermann. Ortho gives you that vital information necessary to take your orchid addiction ... er, I mean, your orchid hobby to the next level (and another 6 orchids).
Ortho's All About Orchids contains excellent information for the beginner. It is a must have book for the first time orchid grower.
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Each plant is described by habit, leaves, flowers, light, soil, fertilizer, pruning, propagation, uses, etc. The information is fairly meager, about one sentence per item. Many of the sentences are repetitive and extremely general. For example, "fertilize with 5-10-5", is listed as advice for 97 out of 100 annuals. I'm not saying the advice is wrong, I just wonder why it must be repeated 97 times. At the beginning of the annual section, couldn't they say "fertilize most annual with 5-10-5", then go into details about the three plants that get treated differently. (By the way, the 3 special case plants are Amaranthus, Basil, and Flowering Maple).
The photography is a high point. Images are crisp and clear, most pictures are large (6 inches height). Unfortunately, the species or variety in the photograph is never identified.
The information is very general. For example, one of the 100 Best Perennials is listed as Anemone (Windflower, European Pasqueflower, Japanese Anemone). Egads! There is an extreme difference between two inch tall Windflower and three feet tall Japanese Anemone. Then they list uses as "cut flowers". Yeah, right! I can just see them now, on their hands and knees, harvesting the tiny flowers from the two inch tall plant. Listing characteristics of Windflower, European Pasqueflower, and Japanese Anemone in the same discussion is not useful gardening advice.
I have mixed feelings about this book. It's a great beginner's guide, but not a complete encyclopedia. Expert gardeners will find little of value in the book. For beginners, it's a 5 star book. For garden experts, it's only a 3 star.