Newly purchased cinder blocks are likely to leach more alkalinity than are older, used kinds. Even so, repeated testing of the planting mix might be required to determine if pH rises over time. Perhaps the more important factor will be the very cramped root space available in a cinder block.
Resources for you:
- “Growing Your Own“ discusses container gardening on page 3. https://catalog.extension.oregonstate.edu/files/project/pdf/em9027.pdf
- “Growing Strawberries in Your Home Garden” https://catalog.extension.oregonstate.edu/sites/catalog.extension.oregonstate.edu/files/project/pdf/ec1307.pdf
-This tip sheet offers additional ideas for small space gardening: http://ext100.wsu.edu/clark/wp-content/uploads/sites/7/2014/02/Strawberries.pdf