Sand, pumice, perlite, D.G., the list goes on for inorganics. Anything that will shed (rather than hold) water, but be careful NOT to introduce BEACH sand or MASONRY GRADE sand (too salty). Since you are using drip emitters, you can adjust the flow to each plant by changing the emitter to one with more or less flow. I DO NOT recommend using "variable flow" emitters, as they have a tendency to leak horribly. I have LOTS of experience installing and REPAIRING drip systems as a landscape contractor. I imagine you have tapped into the system formerly used for watering the lawn. Make certain this area is on a separate control station than any lawn area. You want complete and separate control, and certainly don't want to set your timer based on one area, only to have too much or too little time for the other.

I agree with Sandy, like with many others on this forum you are no slouch when it comes to leps either. My comment was only to state why I didn't feed her with every shred of data because I know she is a very capable field researcher that prefers to discover on her own. Everybody has to approach this field at the level they are comfortable with, why many only explore their back yard while others brave the wilds. Nothing wrong with either if that's all they want. For those of us on the down slide in health and not capable of the field work anymore, we simply have to live that part through others. To maybe satisfy your need to know a little more Susanlynne... Among many others, I asked her to look for the Parnassius (3 sp/ssp) at one site in particular because at over 10,000' some of the females can be almost entirely black, not usually seen except very high at places you normally have to make long and step hikes to. Colias gigantea harroweri is one I'd also like her to see. Even on the BTP it usually takes long and steep hikes to get to, so I gave Sandy a possible short side trip out of Grand Teton Nat'l Park to a place where she can almost drive to them. A couple more that will be easy Colias for her to look for are C. meadii medii that are everywhere up high, and the very rare this far south C. meadii ellis and C. pelidne skinneri. Also Lycaena phlaeas arctodon because the race up there is almost red and simply gorgeous, and L. cupreus snowii and atremisia to go with it since she likes the coppers. There are over 50 Nymphalids up there... but I pointed her to the 14 sp/ssp of Speyeria and 8 of Boloria mostly. Also to Euphydryas editha hutchinsi alt fm montanus because it is the smallest from this genus and was named for its discovery on the BTP. Boloria eunomia ursadentis is the rarest resident lep on the BTP at least as far as how many have ever seen it, but it takes knowing exactly what to look for, how to recognize what you see and often long hikes to find it's small colony. Took me most of two summers to find them, and I knew almost exactly where to look. And over the second and third summer I learned that the colony moves through out the season and can be displaced at least 3+ miles during the season. Sandy won't have time and won't be able to make what could be a long hike this trip to hunt for them. But at one site I recommended it is possible she could see a stray blown by the wind from the small colony. I also pointed her to some of the Satyriidae, specifically Oeneis melissa beani because it will be easy at one site instead of the long/step climbs normal to see them, and O. taygete edwardsi only because they have two forms that are biennial at the same site. Hope that somewhat satisfies your appetite Susanlynne. I'm as excited as you are to see how her trip goes because I know she will find many new species of both leps and plants on it to add to her life list. The vistas up there are second to none, so I'm sure she will get a lot of pictures of them as well. If I still had custody of all my pictures from my extensive lep travels I certainly would have posted them on this forum long ago, and those from three summers up on the BTP would have been among my favorites. Larry

DO NOT SHOP HERE. Worst experience I have ever had with a nursery (and I have dealt with many of them). I ordered two bare root trees.. Several weeks later, one tree showed up completely leafed out with the leaves all dead. I placed it in water 30 min after it was on my porch and 5 hours later the leaves were all still obviously done. The second tree had a huge major crack in the main root. I sent the same attached pics to TyTy asking for a refund, and got a generic reply that because of covid 19 they where not responding to emails. I called two times and was put on hold for 20 min each time and never reached a live person. When I finally did talk to someone I was told they would need to discuss this with a manager. Later that day I was told that the crack in the root would likely eventually heal if planted, and the tree with the dead leaves had been potted before it was shipped, and it likely still alive and would shoot some new leaves if planted. That tree was not potted and it was dried out. I did not order struggling / damaged plants that were already going to go through transplant shock and might have a chance to survive. This is tree planting 101 and I have been treated horribly. I still have not received a refund, or offer or credit or replacement trees.

Try Neato, which comes with strips, you cut. Keeps them from going where you don't want them to go as well as rooms that don't need cleaning. Love my Neato!