Experts and BHG readers answer.
periwinkle and gerbera daisy seeds
Thanks for writing. You can save seeds from these plants. However, they may not come true to form next year --- meaning the plants you get won't be the same varieties you grow this year. So if there are special characteristics in the plants you're growing this year, you may be best off purchasing new plants or bringing them indoors for the winter and treating them as houseplants.
---Justin, Senior Garden Editor, BHG.com