Generate a full detail guide on creating a 'cut flower' garden. The guide should be beautiful and practical. It must include: 1. A guide to garden layout and bed preparation for easy cutting. 2. A detailed list of the best 'cut-and-come-again' flower varieties (e.g., Zinnias, Cosmos, Dahlias). 3. A section on the importance of succession planting for continuous blooms. 4. A step-by-step guide on how to properly harvest and condition your flowers for the longest vase life. Please include a supportive disclaimer.