There are currently no biological control agents for asparagus fern.

Spray the asparagus fern with a glyphosate-based systemic herbicide such as Roundup. Ferns can be hard to kill, especially with an organic herbicide such as vinegar. Vinegar can kill a fern’s existing foliage during winter or any other time of year, but it won’t necessarily stop the plant from reappearing.

Roundup is a Glyphosate-based product, meaning it will kill any actively growing plant it is sprayed on. If you spray it on asparagus beds with actively growing spears or ferns, you will kill the asparagus along with the weeds.

The most common reason for an Asparagus Fern turning brown is a lack of humidity. Asparagus Ferns love humidity and need to be misted with water daily. Other causes for it turning brown include sunburn, too much heat, and nutrient deficiency.

Plant asparagus fern in full sun or light shade; plants grown in full sun are more compact and dense than those grown in shade. It does best in moist soils rich in organic matter but tolerates almost any conditions and is fairly drought tolerant once established.

Overwatering or underwatering are also culprits in the yellowing of asparagus fern leaves. Overwatering can damage the roots, which in turn will show up in the leaves. Make sure your asparagus fern is planted in well-draining soil in a pot that has drainage holes. Again, repotting the plant is the answer.

Low relative humidity may make Asparagus sprengeri drop needles or cause the stems to turn yellow. Cut off the yellow stems at soil level – a matter of good grooming. Increase humidity by setting the port on a pebbles in the bottom, and keep water on the pebbles. The soil should be kept moist all the times.

All asparagus fern types need hard pruning every three years to rejuvenate their growth. It is best done in spring before new growth emerges. Cut back the entire plant to within 2 to 3 inches of the soil using sharp, clean pruning shears and discard the fronds.

Water potted plants regularly to keep the soil moist. Water garden plants once or twice a week, so the soil doesn’t dry completely. Asparagus ferns are moderately drought tolerant, but they will grow at a slower rate without sufficient moisture, notes the University of Florida.

Keep the plant well watered in all situations and repot every few years. Care of asparagus ferns indoors involves misting the arching stems to provide humidity to the plant. A spiky, shade loving plant does well at the center of the pot, surrounded by the cascading branches of the asparagus fern.

Overwintering. If your outdoor temps dip below 55 degrees Fahrenheit, bring your asparagus ferns inside (if they’re not already there). Keep them in bright light, away from drafts and radiators. Do not overwater, this can cause root problems.

Get your bypass pruners out to fix an asparagus fern with bare stems.

1. Spray the blades of your pruning tools with household antiseptic cleaner.
2. Cut your asparagus fern to the ground in early spring every three years to keep the plant full from base to tip.

The main cause of a leggy asparagus fern is a lack of light. If you notice your asparagus fern becoming leggy and long stems growing outwards this is because they’re trying to grow towards the light. So if you notice this happening the best thing to do is to move your plant to a brighter spot.

Ideally, asparagus should be cut back in the fall but it is important that you wait until all of the foliage has died back and turned brown or yellow.

Asparagus ferns do not require periods of winter dormancy but will appreciate a resting period and reduced watering during the winter months. To promote dense plant growth, pinch back the stem tips. If plant shape becomes too sprawling, the stems can be cut back close to the soil to regenerate and encourage new growth.

Asparagus ferns tolerate full sun, although their leaves tend to yellow. They perform better with morning sun and afternoon shade, or even light shade. The plants are very tolerant of high temperatures, though, and grow vigorously in the heat of the summer, when many other plants wilt.

Asparagus ferns will grow in bright to low light, and even do well with artificial light. In lower light conditions, the foliage may turn a lighter shade of green. It’s common to move the plant outdoors during summer.

Asparagus ferns are adaptable and will grow in full sun to shade. Their foliage, however, tends to look somewhat yellow when grown in full sun. Their growth and color tend to be better if they receive some shade for part of the day.

Now, let’s get to the question: does asparagus regrow after cutting. The answer is yes because perennial plants return year after year.