Have canna red king humbert " " the president cana 'grande" pindo seedlings in 3 gallon pots meyer lemon cuttings Yellow flowering opuntia cactus strawberry plants

For the record, I've now grown all but agave harvardiana outside year round and they have all survived as long as you keep them dry in the winter. I cover them with clear plastic containers that have holes drilled in them to keep the air flowing to release humidity.

More than likely it's scale and that's honeydew dripping from it. I use a concentrate from expert gardener that works great .

Most likely multiple plants. Recently I have seen stores are getting various kinds Ficus and most are multiple rooted cuttings in a single pot. I guess they look fuller that way and perhaps more attractive to customers. For a multiple trunk tree the individual trunks will be very close to each other at the soil line.