I just stuck a determinate Roma tomato plant cutting called "Invincible" in pro-mix with a base of water under the pot, but I didn't soak it in water for 3 days before potting it like the last time and found out that I had to cover it with a bucket to bring it back, it almost died on me. I conclude that soaking it in water first for a few days is a mandatory step, otherwise I need to cover it to keep it hydrated. 
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