This section is from the book "The Gardener V3", by William Thomson. Also available from Amazon: The New Organic Grower: A Master's Manual of Tools and Techniques for the Home and Market Gardener.
Avoid keeping the plants longer in heat and moisture than is necessary to complete the first set of growths, unless wood and not buds is the aim, but rather shift to a cool house and lessen the amount of water given. Avoid putting the plants into some sheltered corner outside to "ripen " their wood while they are yet tender in leaf, which will suddenly put the plants to premature rest, which is sure to cause rusty foliage and shoots without buds. June is quite soon enough to prevent disappointment. At this period they may either be retained in their pots, or, if much pot-bound, planted into the open ground for the time being. A. Kerr.