diff --git a/grow/cli/main.go b/grow/cli/main.go
index bd9c39b..fb66a89 100644
--- a/grow/cli/main.go
+++ b/grow/cli/main.go
@@ -6,6 +6,7 @@ import "math/rand"
 import "os"
 import "time"
 
+import "github.com/firestuff/subcoding/asm"
 import "github.com/firestuff/subcoding/grow"
 
 func main() {
@@ -28,8 +29,31 @@ func main() {
 		log.Fatal(err)
 	}
 
-	_, err = def.Grow()
-	if err != nil {
-		log.Fatal(err)
+	statusChan := make(chan grow.Status)
+
+	go func() {
+		_, err = def.Grow(statusChan)
+		if err != nil {
+			log.Fatal(err)
+		}
+	}()
+
+	for {
+		status, ok := <-statusChan
+
+		if !ok {
+			break
+		}
+
+		if status.BestProgram == nil {
+			continue
+		}
+
+		src, err := asm.Disassemble(status.BestProgram)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		log.Printf("New best score %d / %d (after %d attempts):\n%s", status.BestScore, status.TargetScore, status.Attempts, src)
 	}
 }
diff --git a/grow/grow.go b/grow/grow.go
index 90de4c0..1d93bdd 100644
--- a/grow/grow.go
+++ b/grow/grow.go
@@ -1,44 +1,47 @@
 package grow
 
-import "log"
-
-import "github.com/firestuff/subcoding/asm"
 import "github.com/firestuff/subcoding/gen"
 import "github.com/firestuff/subcoding/vm"
 
-func (def *Definition) Grow() (*vm.Program, error) {
-	high_score := 0
+func (def *Definition) Grow(statusChan chan<- Status) (*vm.Program, error) {
+	status := Status{
+		TargetScore: uint64(len(def.Samples)),
+	}
 
-	log.Print("Starting grow run...")
+	if statusChan != nil {
+		statusChan <- status
+	}
 
 	// TODO: Score should be number of output criteria, not number of Samples
-	for progs := 0; ; progs++ {
+	for {
+		status.Attempts++
+
 		prog := gen.RandProgram(def.GlobalMemorySize, def.FunctionMemorySize, def.InstructionLimit)
 
 		score, err := def.Score(prog)
 		if err != nil {
+			close(statusChan)
 			return nil, err
 		}
 
-		if score > high_score {
-			high_score = score
+		if score > status.BestScore {
+			status.BestScore = score
+			status.BestProgram = prog
 
-			src, err := asm.Disassemble(prog)
-			if err != nil {
-				return nil, err
+			if statusChan != nil {
+				statusChan <- status
 			}
 
-			log.Printf("New high score %d / %d (after %d attempts):\n%s", high_score, len(def.Samples), progs, src)
-
-			if score == len(def.Samples) {
+			if status.BestScore == status.TargetScore {
+				close(statusChan)
 				return prog, nil
 			}
 		}
 	}
 }
 
-func (def *Definition) Score(prog *vm.Program) (int, error) {
-	score := 0
+func (def *Definition) Score(prog *vm.Program) (uint64, error) {
+	score := uint64(0)
 
 	for _, sample := range def.Samples {
 		state, err := vm.NewState(prog)
diff --git a/grow/status.go b/grow/status.go
new file mode 100644
index 0000000..641b847
--- /dev/null
+++ b/grow/status.go
@@ -0,0 +1,12 @@
+package grow
+
+import "github.com/firestuff/subcoding/vm"
+
+type Status struct {
+	TargetScore uint64
+
+	Attempts uint64
+
+	BestScore   uint64
+	BestProgram *vm.Program
+}