The answer to how long rooting takes depends on what you're growing. Most cuttings need between two and sixteen weeks to form roots. Softwood cuttings from herbs and houseplants root fast. Hardwood cuttings from trees and shrubs take much longer to get going.
I tracked this myself last summer with a tray of mixed cuttings. Every week I gave each cutting a gentle tug to feel for root resistance. My spirea cuttings held firm after just two weeks. The hydrangea cuttings took about three and a half weeks to resist the tug. But my holly cuttings? Those didn't show any root grip for over ten full weeks. Same tray, same conditions, and wildly different speeds. The rooting time for cuttings varies more than most people expect.
Here is what happens inside the stem during those weeks of waiting. First, your cutting forms a callus at the wound site where you made the cut. This callus is a mass of healing cells that seals the wound. Then auxin hormones signal the callus cells to turn into root tissue. Some species send that signal fast, while others take their time. Older, thicker stems are slower because the signal has to travel through more dense wood to reach the right cells.
Research from UGA Extension and Missouri Botanical Garden backs up what I saw in my own trays. Spirea roots in as little as two weeks from softwood cuttings. Begonia needs about three weeks from stem tips. Roses and hydrangeas both land around three to four weeks if you take them at the right time. Chinese holly is one of the slowest at ten to twelve weeks from hardwood cuttings. These times assume warm temps, high humidity, and clean rooting media.
Your cutting rooting timeline should look something like this for a weekly check routine. In week one, just check that the soil stays damp and the humidity dome holds moisture. Don't touch the cuttings yet. At weeks two and three, try a soft tug on each cutting to feel for any resistance. If the cutting holds firm, roots are forming. By weeks four through six, most softwood cuttings should have a solid root system. If you're working with hardwood, stay patient through weeks eight to sixteen before you expect results.
The gentle tug test is the best way to check your progress without pulling the cutting out of the soil. A cutting with new roots will resist when you tug with two fingers. One without roots slides right out. I do this test once a week and mark each cutting with a small tag noting the date I first felt resistance.
Temperature plays a big role in how fast your cuttings root. Keep your tray between 70-75°F (21-24°C) for the best results. Colder temps slow down cell growth and can add weeks to your wait time. A heat mat under your tray can speed things up if your house runs cool. I use one during winter months and it cuts my rooting time by about a full week on most species.
Don't give up on your cuttings too early. I've had holly cuttings that looked dead for twelve weeks and then surprised me with a burst of roots in week thirteen. Give every cutting its fair chance by waiting the full expected time before you toss it out. Patience is the one tool that separates good propagators from great ones.
Read the full article: A Full Guide to Grow From Cuttings
