What are the disadvantages of soil blockers?
Moisture Management: Soil blocks can dry out faster than traditional pots, requiring careful attention to watering. This isn’t necessarily a disadvantage, but more of something you need to be aware of. But remember, soil blocks will dry out much faster than soil in plastic seed trays because they are exposed to evaporation on all sides. Water regularly to keep consistent moisture in your blocks.
Can I reuse soil that a plant died in?
It’s generally fine to reuse high-quality potting soil if whatever you were growing in it was healthy. But can you reuse potting soil that’s been home to pests? If you noticed pests or diseases on your plants, it’s best to sterilize the mix to avoid infecting next year’s plants. Like many aspects of gardening — it depends. If the potting soil has just been used for one season and all the plants were completely healthy, sure. However, if you know your plants ended up hit with downy mildew, or other plant disease, you’ll want to either toss the soil or spend some time sterilizing it.