Upright meaning
The harvest. Effort put in earlier is coming back to you, in its own season, not before.
Reversed (merkstave)
Jera looks the same either way up, so it has no reversed meaning. Read it upright every time.
A question to sit with
What have you planted that simply needs more time?
Its ætt
Jera belongs to Heimdall's ætt, the runes of forces outside your control and the growth they force.