Hey Kadra...the 1/2 full bag of left over soil should be fine to use. I would pre-moisten the soil however. The old soil could have dried out considerably and sometimes wetting it can be troublesome. Also, if it's so hard that it has become a brick (or at least very hard), be sure to break it up some. You don't want the old soil to become a cement for your plants. If you fear that the old soil will not be able to provide the drainage that your plants probably will need, go ahead and purchase some perlite, sand or pumice pebbles. You can treat your soil with these amendments to increase proper drainage and air porosity. Also, if the old soil was impregnated with any kind of fertilizer, that fertilizer may have broken down, leached out, etc...You may want to add a little fertilizer (go light on the fertilizer at first) when you use this soil. I hope this information is helpful. Let me know if you have any further questions. Cheers...Dr. Robby
