Figs root fairly fast though I have not rooted any in water. From what I have read though you should see something within 7-10 days. Oxygen is good for plants. Why are you covering the jars?

takes 20-50 days to root... The cutting that is the trunk I usuall lay it in its side & cover 1/2 the stem with soil. There are nodes & buds along the stem I try to arrange it so most of these buds are at or above the soil

I have never worked with cucumber cuttings but I have with melons. Both of these plants belong to the same genus, Cucumis, so I'm going to assume that they react very similarly. I took a cutting from one of my heirloom melons so that I could root it far from other melons to avoid cross-pollination. I thought it would be best to place the cutting in lightly fertilized water so that it could root. However, it initially only formed little stubs that looked like roots at the first node. It didn't get past this stage as long as I had it in the water. Soon after I moved it to a pot with potting mix, the roots took off growing. I wish I could answer your question with certainty but I don't remember how many days I had it in the water. If I had to guess I would say about 10 days in the water and about 4 days to start growing once I put it in the pot with potting mix. My effort was ultimately futile because the poor thing developed powdery mildew.

Winter cutting is an option. For years I use this method for multiple fruits However, there are certain conditions for achieving results. A good start is half the battle. Winter cutting means, take cuttings about 30 cm long pensil thick to survive they need reserve substances use a good rooting hormone. plant cuttings about 20 cm deep in a good airy soil mixture and leave them all winter long dormancy outdoors Frost can do any harm, you need protect them from drying freezing cold wind. second option: take your cuttings and keep them until March. keep them in a plastic bag and keep on a dark cool place, optionally you can use clonex and leave it till March. By this time you can see callus, thatâÂÂs a good sign. After that you can plant in soil. third possibility: Propagating plants by air layering : application in spring you can find plenty info on the web. fourth application: propagation of pear rootstocks Quince simply through a bottle of water. happy growing pears from cuttings Alcedo