Can deceased family members garden from beyond?

100 yr old family home was torn down last year. Since then flowers are coming up all by themselves. My mom gardened like crazy and now the lot is awash in petunias, hollyhocks, morning glorys and some others I don't know. A poppy showed up even. Just wondering if I have a ghostly helper. I didn't plant any of these flowers. Like to think my mom is still gardening.