Are sextant mods really that lousy?

Hi there...
I got the sextant mod that says that in a harvest, lifeforce is doubled (and monster life too). Sounded great. Only in hindsight I realised, that it didn't say, that the map will contain a sacred grove in the first place, it didn't even raise the chance to get one. In all three maps - not a single grove appeared (despite the fact that I have all possible grove atlas points set), so the sextant was a complete waste... Did I miss something, is there any way to guaranty a grove? There are no grove scarabs, there's no grove map crafting option (currently)... So IS there a way I don't know, or is that mod as bad as I think???

There is an implicit mod on maps that guarantees a grove.

https://www.pathofexile.com/trade/search/Kalandra/XbeYmn4IP

There is a sextant mod for "Harvest in maps": https://www.poewiki.net/wiki/List_of_sextant_mods
There is also a map implicit for it:
You can only have one Harvest per map I think though so using both at once will probably waste one.

Ok, thanks a lot!