The main differences between emitter and collector are doping concentration and size. The emitter is heavily doped, while the collector is lightly doped. You could try to swap them, but you'll get a very low \$H_{FE}\$, probably even less than 1.
Image Credit: Photo: Oxmoor House. SEASON: Although available year-round, eggplant is at its peak from July to October. CHOOSING: When selecting, look for eggplants with firm, glossy skin. Size and color vary widely among types, but the eggplant should feel heavy. Avoid those with wrinkled skin, soft spots, or brown patches.
Eggplant loves to be toasty warm. It will not withstand much frost or cold temperatures. In Phoenix, the first expected fall frost is around December 5. Some gardeners have had luck in getting their eggplant harvest to last through part of December, but you would need to keep the plant protected from cold temperatures.