Japanese maple wilt

I have several Katsura Japanese maples, some of which I rooted and the mother plant. All the smaller rooted ones wilted off and died and now I notice the leaves on the mother plant are also blackening off, shriveling etc.…

Roses

I have 6 iceberg roses growing in pots on my terrace. Last summer a number of them had black spot. Do I respray when the leaves come out? How often? What about the soil?…

Basil failing

I have successfully grown basil in this raised cedar planter (Peterborough) for the last five years, but this year my plants are in distress. When planted, the leaves were bushy and green, but the leaves have yellowed and have brown…