What are your night temperatures generally like? If it's under 15C (60F) all summer, you can probably forget about it.
Since I am trying also in a friend's garden a few varieties (two of which are not true to type, bummer), where it's really quite cold (rarely above 15 at night), I will have some things to report.
One thing I can say is that black mulch plastic foil spread over a nice size area (at least a square meter) seem to help visibly, this year was colder than last and even so plants are doing much better.
The second is that seed vendors should really bag their eggplants, they cross easily.
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