Nothing is easier to use and gets better results than the Black and Decker 20V Max Lithium Ion Garden Cultivator. It weighs a tad over 8 pounds, which makes it easy to maneuver, it's battery powered for the ultimate in portability, and the charge will last for up to 325 square feet of soil cultivation. It has two counter rotating tines that will break up topsoil and tear up weeds. It is thin enough to get between plants, comes with an Energy Star charger and forever changes back-breaking cultivating into a Saturday afternoon hobby.
The newest design in manual cultivators are rotary, and the Fiskars 9896 Telescoping Rotary Cultivator is the best one out there. By manually pushing it back and forth over the ground, the rotary tines chop up hard dirt, loosen and aerate the soil and pulverize weeds. No power, no problem. The center tines are removable to cultivate seedling rows, and the handle extends out to 60 inches so that it will fit anyones reach. It's lightweight, and will go where others can't.
If you want a powered cultivator but don't want the higher cost of a battery powered machine, check out the Sun Joe TJ599E Aardvark 2.5-Amp Electric Garden Cultivator. It is corded, so it doesn't pollute, yet gives you serious cultivating power for any size garden. The shaft adjusts for anyone's height, an adjustable handle gives you comfort in any position and the 2.5 amp motor, coupled to four steel blade tines, will loosen dirt easily while chopping up weeds.
To keep your garden soil loose and cultivated, particularly in out-of-the-way spaces where power is not an option, the Earthway 6500W High Wheel Garden Cultivator with 24-Inch Steel Wheel is right for the job. The large and thin metal wheel allows you to easily push this cultivator between rows of plants, the handles have 3 adjustable positions, and the tines can be adjusted for depth. It comes in either solid oak or metal handles for the ultimate in durability.
For smaller gardens when you don't need anything extravagant, the CobraHead Weeder and Cultivator might just be the ticket. It will break and loosen soil, it keeps the ground aerated and the sharpened high carbon steel blade will slice and dice through weeds with little effort. The steel fingernail type blade design makes it perfect for smaller gardens, garden boxes or planters. It fits both right handers and left handers, and is one of the easiest to use manual cultivators there is.