Many beginners assume all microgreen seeds need soaking. They don't — and soaking the wrong seeds actually causes problems. Here are the varieties that must never be soaked before sowing.
Seeds That Must NOT Be Soaked
| Variety | Why Not to Soak |
| Radish | Too small — clumps together when wet, impossible to spread evenly |
| Mustard | Too small — same problem as radish |
| Broccoli | Very fine seed — soaking creates clumps |
| Basil | Produces mucilage gel coating when wet — impossible to sow |
| Chia | Produces mucilage gel — same as basil |
| Amaranth | Tiny seeds — no benefit from soaking, just creates mess |
| Coriander | Soaking increases rot risk with no germination benefit |
The Basil Mucilage Situation
Basil and chia seeds produce a thick gel (mucilage) when they contact water. This is actually a feature, not a bug — it helps the seed stay in place on the cocopeat surface during germination. But if you pre-soak them, the gel forms before sowing and the seeds become an impossible sticky clump. Always sow basil and chia dry.
Not sure about your variety? Ask Sonia 🌱