diff --git a/internal/service/ops.go b/internal/service/ops.go
index 081b1ab..5c7340d 100644
--- a/internal/service/ops.go
+++ b/internal/service/ops.go
@@ -605,17 +605,16 @@ type DescribeGroup struct {
 	// DaysToMaturity is the plant's, when the catalog knows it — with PlantedAt,
 	// enough to say when the harvest is due.
 	DaysToMaturity *int `json:"daysToMaturity,omitempty"`
-	// Each lists the plops individually (id, version, location) only when the
-	// group has at most maxListedPlops of them.
+	// Each lists the plops individually (id, version, position, location) only
+	// when the group has at most maxListedPlops of them.
 	Each []DescribePlanting `json:"each,omitempty"`
 }
 
 // DescribePlanting is one plop with its position and a rough compass location.
 // ID + Version let an agent address a single plop — remove it or move it — the
-// same way DescribeObject.Version lets it edit an object; XCM/YCM (the object's
-// local frame) let a move keep the layout the plops had, which "north, south"
-// alone cannot: asked to move four tomatoes in a column "keeping the same
-// spacing", the live assistant re-laid them as two pairs for want of these.
+// same way DescribeObject.Version lets it edit an object. XCM/YCM are in the
+// object's local frame: they are what lets a move keep the layout the plops
+// had, which the compass word alone ("north", "south") cannot.
 type DescribePlanting struct {
 	ID        int64   `json:"id"`
 	Version   int64   `json:"version"`
diff --git a/internal/service/ops_test.go b/internal/service/ops_test.go
index 2a8b2b3..8ba0982 100644
--- a/internal/service/ops_test.go
+++ b/internal/service/ops_test.go
@@ -628,14 +628,20 @@ func TestDescribeGardenGroupsByPlant(t *testing.T) {
 	if want := 2*derivedCount(20, 25) + 3; ba.Plants != want {
 		t.Errorf("basil plants = %d, want %d", ba.Plants, want)
 	}
+	// The position is what lets a move keep the layout; "south" alone can't. The
+	// three basil plops were placed at exactly these local points.
+	placedAt := map[[2]float64]bool{{-100, 100}: true, {0, 150}: true, {100, 100}: true}
 	for _, e := range ba.Each {
 		if e.PlantedAt == "" || e.Version == 0 || e.ID == 0 {
 			t.Errorf("listed plop %+v is missing id, version or date", e)
 		}
-		// The position is what lets a move keep the layout; "south" alone can't.
-		if e.YCM < 100 || (e.XCM != -100 && e.XCM != 0 && e.XCM != 100) {
-			t.Errorf("listed plop %+v doesn't carry the position it was placed at", e)
+		if !placedAt[[2]float64{e.XCM, e.YCM}] {
+			t.Errorf("listed plop %+v is not at a position a basil was placed at", e)
 		}
+		delete(placedAt, [2]float64{e.XCM, e.YCM})
+	}
+	if len(placedAt) != 0 {
+		t.Errorf("positions never listed: %v", placedAt)
 	}
 
 	// The big group's ids are a call away, narrowed to one plant.