Zilis (2000) - Mark R. Zilis, owner of Q&Z Nursery in Rochelle, IL authored a book titled, The Hosta Handbook (ISBN 0-9679440-0-7) in 2000.

This book has been used as a resource for HostaHelper along with The Genus Hosta: Giboshi Zoku by W. George Schmid (ISBN 9780881922011). 

Zilis (2009) - In 2009, Mark R. Zilis' book, The Hostapedia An Encyclopedia of Hostas (ISBN 978-0-9679440-1-2) was published. This is the most extensive book on this species since W. George Schmidt's monograph, The Genus Hosta: Giboshi Zoku.

This book has been used as a resource for HostaHelper along with Mark's previous book, The Hosta Handbook (ISBN 0-9679440-0-7) and The Genus Hosta: Giboshi Zoku by W. George Schmid (ISBN 9780881922011)

zonal - plants of the species, Pelargonium x hortorum, are tender perennials that are commonly sold as "geraniums" to be used in annual beds and borders. One of the more popular types of Pelargoniums are called zonal geraniums because of their scalloped leaf edges and circular ring of brown inside the leaf.

See genus, Geranium.

zonate - formed in concentric rings, pertaining to the development of bacterial tree cankers, characterized by successively enlarged rings of callus, resembling a bullseye target.
zoysiagrass - a turfgrass species adapted to the warmer regions. In northern temperate zones, it is undesirable because it goes dormant and turns brown very early in the fall and stays straw-brown until late May. It is also an aggressive grass that will spread into neighbors' yards.
 

 

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