Well, that's suboptimal. Leareth moves the scrying-site around a bit more, trying to find a secluded spot. 

The next place he tries appears deserted, just an anonymous bit of lovely forest.

Leareth memorizes it, and then backs off and takes a few minutes to rest and replenish his reserves from the nearest node before trying the Gate. When he's ready, he calls the Farseer-Fetcher over. "Promise, can you render him invisible as well, please?" 

She's seen enough of him to do that. Poof.

Leareth very briefly scries the forest again, just to make sure it's still clear, before attempting as efficient a Gate as he possibly can. 

Beautiful forest appears beyond the Gate in a perfectly normal fashion.

The Fetcher doesn't have mage-sight or Thoughtsensing, so Leareth is going to very quickly stick his head through and get a more up-close feel at whether there are nearby minds or magical traps or anything at all concerning.

Nope. Innocent autumnal forest.

The invisible Fetcher goes through, orients his sense of direction, and tries to Farsee the tree a mile away, which he's also pored over the maps and drawings of. 

Really big tree. Not fruiting at the moment but otherwise much like the picture.

What happens if he tries to use Fetching, first to snap an arm-length branch off with a sharp twist, then to teleport it a mile to his current location? 

A few leaves fall off, and a flower, but while the branch is tough it isn't unbreakable. Now he has it.

He steps back instantly and holds it out through the Gate to Promise. 

"Will that do?" Leareth asks her. 

"Yes - thank you -" She takes the branch, almost hugging it, and zooms for the stairs to go up and plant it.

The Fetcher steps back through both Gates into the Work Room. 

Leareth drops his Gate immediately and backs out away from Promise's Gate. Presumably she'll...come back in a minute to close it? It doesn't seem urgent given its location, but he keeps an eye on it anyway. 

She comes back ten minutes later and closes the gate. "Sorry, I was excited."

"I understand." Leareth is smiling, more than he ever has in her presence before. "I am glad we were able to help." He glances at the other fairy gate, presumably not settled yet. 

(The mage watching it chucks a pebble at the wall where the gate is.) 

(It is indeed not settled yet.) "It'll take me a while to get it big enough to live in. Do you want me down here till the gate is settled or can I work on that the rest of the day no problem?"

"You can go up and work on it, I think. It will not take very long to alert you, and I imagine you placed the gate in a remote area? I will make sure to be nearby during the day, so that if a problem does arise I can do an unscaffolded Gate to where you planted it and summon you to close it faster." 

"Yes, it's a ways off, I didn't want to collapse anything once it's huge."

And she zooms away again to grow her tree.

Leareth works nearby, easily grabbable, while his staff watch the settling fairy gate. Every once in a while he scries the surface to check how Promise's tree is coming along. And make sure the site is well-anchored in his mind, in case they very suddenly need her down here because a fairy is about to walk through her open gate by mistake or something. 

Sapphire wanders up to the surface and over to her tree in the late afternoon, asks if she'd like supper brought up here so she doesn't need to step away from her work for as long. 

"If that wouldn't be too much trouble! Or I can just eat haws."