Assuming a fairly high number of druid or ranger agents, trees underground here actually makes a lot of sense.

Care to explain the reasoning?

Craft a magic item that uses sunbeam spells to generate real sunlight underground. Simple.

No. The reason Igon keeps flopping.

It's because of Terprat's causality, the theorem he keeps getting wrong.

The theorem in and off itself means it's best to overcompensate the amount of magic you expect (from calculations) to use than to under do it and produce a weak spell or nothing at all, but it's full meaning is part of a life lesson for young mages.

Life, as a definition, is a series of chaotic and often incomprehensible at first occurences and events, only occasionally impacted meaningfully by the actions of creatures who by now should probably know better.

Sound familiar? Magic is a lot similar, an inherently chaotic force that is barely understood but still shoved at by spellcasters.

So the life lesson is that to really meaningfully affect life you need to do more than is expected of you to really achieve anything.

Igon keeps getting it wrong because he doesn't yet understand the full meaning. He's done a lot so far, setting up an underground sanctuary for people being opressed and raised two wonderful young ladies (Even if they are presently two of the most destructive forces the planet has ever seen), but as far as the back of his mind is concerned (The subconscious, a part heavily involved with spellcasting), he's still done nothing more than what is calculated.

tl:dr, he keeps flopping because he keeps thinking he's done nothing worthwhile with his life

Piercings... Tattoos... Beating up your mother anc changing your name... Yup, just usualy teenage stuff. :P