When bagged potting mix is exposed to excess moisture it can result in a mold/fungal growth. What you see could also be the result of different components of your potting mix breaking down. After the bag is opened and exposed to light and air, it will be less inclined to produce what you found. Using gloves, you can remove the white portions for disposal. If you feel more comfortable, you can also wear a facemask during the removal. At that point, your potting mix will be fine to use. You can also remove the potting mix from the bag and spread it out on a tarp to dry it out in the sun before potting up your plants.
Hi Shelli,
When bagged potting mix is exposed to excess moisture it can result in a mold/fungal growth. What you see could also be the result of different components of your potting mix breaking down. After the bag is opened and exposed to light and air, it will be less inclined to produce what you found. Using gloves, you can remove the white portions for disposal. If you feel more comfortable, you can also wear a facemask during the removal. At that point, your potting mix will be fine to use. You can also remove the potting mix from the bag and spread it out on a tarp to dry it out in the sun before potting up your plants.
Good luck with your planting!