Took mine in rank 8, get it whenever it could fit to your build.
Here is my pattern for Driekple flower.
Get water
Sprinkle until you saw the 1st glow
stop sprinkling after the glow ended.
Get water (just walk)
After you get close to the flower count 10
Start sprinkling until no more glow, then stop
Get water again
count 10 besides the flower
Sprinkle
Stop after no more glow
Get water
count 10
Sprinkle
So on…
best if 2 people, it would only take 15 mins. Flower despawn after sometime, so sprinkle fast if you saw it (1hr or more).