Invertebrates feeding on the roots of dead plants

In fact, a month or two ago, I added, in my terrarium, a clod of soil comprising several plants (mainly Fumaria capreolata, Geranium and Vicia). the problem is that the plants have not held up as well as I thought and are almost completely dry.

Since I would like to avoid removing them entirely by hand (including the roots), I was wondering what types of invertebrates could get rid of them for me.

In my terrarium, I have Armadillidium vulgare, Glomeris (G.margunata and G.esterelana), Julidae, cockroaches, a Gryllomorpha dalmatina, mealworms and two Polydesma).

can these invertebrates play this role or do I turn to other types of invertebrates?