Is there any advantage of taking Drosera leaf cuttings by cutting the leaf where it intersects the crown compared to cutting the leaf 2 or 3 millimeters away from where it joins the crown? A problem with cutting where the leaf intersects the crown is that it may damage the plant or other leaves. It also may be more difficult to cut.
>> For all drosera leaf propagation, there is 2 ways for difference type of drosera.
most common way, "use scissor and cut". It apply to most of drosera. Just make sure cutted leaf have dew (offcouse is long enough). it is not neccessary "cutting the leaf where it intersects the crown"
2nd way is apply to petiolaris complex (as I know, please correct me if im wrong) . Where you need to make leaf pulling instead of cutting. Because, plantlet will produce from the section where the leaf attached to mother plant and not from "dew section". you can refer to http://carnivorousplants.wordpress.com/2009/10/19/propagate-d-paradoxa-by-leaf-pulling/
Also I read in Adrian Slack’s book that it is best to lay the leaves on finely broken sphagnum moss and to just cover the leaves with a thin layer of sphagnum moss. However, another grower suggested to just lay the leaves on peat moss and not cover them at all. An advantage with covering the leaves is that it would help to press them flat on the surface of the growing medium. Some curly leaves may not sit flat and could be separated from the surface if they are not covered.
>> You can use anything to help to laying flat those leaf. Last time, I use small wood stick to do so.
Some people also suggest to cut the longer leaves into several pieces. Is this an advantage apart from that it could enable the leaf segments to remain in better contact with the growing medium compared to a longer leaf?
>> If the leaf is too long (eg filiformis), it is difficult to plant it and it really impossible to flatten the whole leaf. That is main reason to cut it short
The plants I plan to grow are Drosera capensis, spatulata, adelae, venusta, indica and aliciae
>> For the list of drosera above, you can use "cut leaf" method instead of "leaf pulling". As I know, some drosera cannot propagate from leaf pulling, D. burmanii is the most common example. I never try venusta, indica and aliciae, not sure the result.