When to use weekly feed and preplant with seedlings

I have seen some confusion on how much and when to use nutrients in seedling trays while growing seedlings.   I’ve made a short video (see below) that covers when to use weekly feed and preplant in seedling trays.

It is easy to determine which nutrients you will need.  If you are placing seeds into a seedling tray, you only need preplant.  If you are putting seedlings in a seedling tray, you will need preplant and weekly feed.

When adding preplant to a seedling tray, it is always 1.5 ounces of preplant to a full seedling tray. Weekly feed is 3/4 of an ounce to the full seedling tray. The preplant and weekly feed are added before transplanting the seedlings.

For those whose who do not use the Mittleider seedling tray

If using containers other than seedling trays, such as a seedling pot, you can easily calculate and add the correct amounts of nutrients. Place your growing medium into something like a tote that will allow you to measure how many cubic feet of growing medium you have. For every 1/2 cubic foot of growing medium, add 1.5 ounces of preplant and .75 ounces of weekly feed. Mix it in well and then transfer the mixture into your seedling pots.