Have you tried this?
Luke 13
6 And he told this parable: “A man had a fig tree planted in his vineyard, and he came seeking fruit on it and found none. 7 And he said to the vinedresser, ‘Look, for three years now I have come seeking fruit on this fig tree, and I find none. Cut it down. Why should it use up the ground?’ 8 And he answered him, ‘Sir, let it alone this year also, until I dig around it and put on manure. 9 Then if it should bear fruit next year, well and good; but if not, you can cut it down.’”
I’m going to try this. I want my flowering Lilac again. I just adore the smell of the flowers. It is like heaven scent to me.