Preen...the active ingredient is...or used to be Treflan. You apply it every 6 to 8 weeks and water it in...or rake it in. You will have problems eventually with the rock over the Typar. Small debris will build up in the rocks and the Typar will keep it from becoming part of the soil below and you will have weed growth in the rock on top of the Typar. Shredded bark or wood is always a better choice. I would wonder about the dogs sleeping in the mulch that's treated with preemergence before it's well watered i though...I would keep them out for several days aftere applying. Linda C

I think it looks SO much better in it's new pot.

In the latter case if you are in an area with unsuitable autumn weather or soils this can affect results with fall color of maples. The Tatarian maple cultivar is selected for use in areas with alkaline soils etc. but red maples do not color well in alkaline soils - and fall color of seedling red maples varies from yellow to nearly purple depending on the genetics of the individual seedlings. Plantings or wild stands of genetically distinct individuals (rather than multiple specimens of a clonal cultivar) can be a kaleidoscope of different colors in autumn. Root damage I don't see as being related. In fact, if you stuck them in using care to avoid root damage that could have been a mistake. The most important thing when planting a tree is to make sure the roots are spread out in the hole and not kinked or circling, and that the same soil is present throughout the hole, with no zones of differing soils. Intact original soil balls are not desirable unless the backfill soil and the soil around the hole all happen to be the same as the soil inside the rootball - not a usual circumstance.

Totally extravagant bit of floof, that! Snowpea in Montreal