I would, if it was me call the place where you purchased this product.
The amount you need depends on how thick layer you want for 195 sq.ft. area. For example, if you want to put down a 2" layer in 195 sq.ft. area you will need to buy 32 cubic feet go this product. Since I no longer have the bag I can not look up the cubic feet information on the bag. Vist the local HD and see how many cubic feet each bag contains and then buy number of bags accordingly. Foe example, if each bag is 1 cuft you will need to buy 32 bags; if each bag is 2 cuft then you will need to buy 16 bags etc. If you put more it won't hurt any. Hope this is helpful.
Sorry I do not have the bag to look up the cuft but if you call your local HD store then someone in the garden department can look that up..
If that HD location does not have in stock then you can order on HD website and choose that store location for pick up.
I would say it depends on the plant(s) you intend to use it on and how much you would use. Some plants do not require as much organic material and may be more sensitive to it, causing the leaves to burn. The same can be said for outdoor plants. I would recommend looking up the specific plant needs beforehand so as not to overdo it.
You can definitely mix it with potting mix or the native soil. I used it in the beds and results are very good. I would not recommend it using it alone.
My guess is about 1.5 cu ft
This product has 1.25 cu. ft. of coverage.
Hi Debra. Thank you for your question. At this time, we do not deliver the Black Know 50 lb. Organic Compost. This may vary by location or product. Please check with you local Home Depot for further information. Please let us know if we can be of further assistance. Rick_HD_OC