New Jersey’s proximity to the coast moderates temperatures, allowing artichokes to be planted slightly earlier than inland areas. Knowing the best time to plant artichokes in New Jersey is key to a successful harvest. This guide covers everything you need to know for timing, soil prep, and care.
Artichokes are perennials in warm climates, but in New Jersey, they are often grown as annuals. The key is to work with the state’s unique growing zones, which range from 6a to 7b. Your planting window depends on your specific location and whether you start from seed or transplants.
Best Time To Plant Artichokes In New Jersey
The ideal window for planting artichokes in New Jersey is from mid-April to early May, after the last frost date. For most of the state, this means waiting until soil temperatures reach at least 50°F. Coastal areas like Atlantic City can plant a week or two earlier than inland spots like Trenton.
If you are starting from seed indoors, begin 8 to 10 weeks before your last frost date. This usually means starting seeds in late February or early March. Transplants should be hardened off for a week before moving them outside.
Understanding New Jersey’s Climate Zones
New Jersey has three main climate zones: the northern highlands, central piedmont, and southern coastal plain. Northern zones (6a) have colder winters and shorter growing seasons. Southern zones (7b) are milder and allow for earlier planting.
- North Jersey (Zones 6a-6b): Plant transplants in early to mid-May. Soil warms slowly here.
- Central Jersey (Zones 6b-7a): Plant from late April to early May. This is the sweet spot for most growers.
- South Jersey (Zones 7a-7b): Plant from mid-April to late April. Coastal influence helps.
Check your local frost dates using the USDA hardiness map. The last frost in New Jersey typically occurs between April 15 and May 15, depending on location.
Starting Artichokes From Seed Indoors
Artichokes need a long growing season, so starting seeds indoors is highly recommended. Begin 8 to 10 weeks before your last expected frost. For most of New Jersey, this means starting seeds in early March.
- Fill seed trays with a sterile seed-starting mix.
- Plant seeds ¼ inch deep and keep soil moist.
- Maintain a temperature of 70°F to 75°F for germination.
- Provide 14 to 16 hours of bright light once seedlings emerge.
- Thin seedlings to one per cell after they develop two true leaves.
Seedlings are ready to transplant when they have 4 to 6 true leaves and are about 6 inches tall. Harden them off over 7 to 10 days by gradually exposing them to outdoor conditions.
Preparing The Soil For Artichokes
Artichokes thrive in well-draining, fertile soil with a pH between 6.0 and 7.0. Before planting, amend your soil with compost or aged manure. Work the soil to a depth of 12 inches to allow roots to spread.
In New Jersey, heavy clay soil is common in many areas. If your soil is clay, consider raised beds or adding sand and organic matter to improve drainage. Artichokes do not tolerate waterlogged roots.
- Test your soil pH in early spring.
- Add lime if pH is below 6.0.
- Mix in 2 to 3 inches of compost.
- Use a balanced fertilizer (10-10-10) at planting time.
Transplanting Artichokes Outdoors
Transplant artichokes on a cloudy day or in the late afternoon to reduce transplant shock. Space plants 3 to 4 feet apart in rows that are 4 to 5 feet apart. This gives them room to grow large leaves and produce big buds.
Dig a hole slightly larger than the root ball. Place the transplant at the same depth it was in the pot. Water thoroughly after planting and add a layer of mulch to retain moisture and suppress weeds.
In New Jersey, artichokes benefit from consistent moisture, especially during dry spells. Aim for 1 to 2 inches of water per week. Drip irrigation works well to keep foliage dry and prevent disease.
Caring For Artichokes Through The Season
Artichokes are heavy feeders. Apply a balanced fertilizer every 4 to 6 weeks during the growing season. Side-dress with compost or fish emulsion for an extra boost.
Watch for pests like aphids, slugs, and earwigs. In New Jersey, aphids can be a problem in early summer. Use insecticidal soap or neem oil if needed. Slugs are more common in wet springs; handpick them or use slug bait.
Diseases like powdery mildew and botrytis can occur in humid conditions. Space plants properly and water at the base to reduce humidity around the leaves. Remove any infected leaves promptly.
Harvesting Artichokes In New Jersey
Artichokes are ready to harvest when the buds are firm and tight, usually 80 to 100 days after transplanting. In New Jersey, this means harvesting from late July through September. Cut the bud with 2 to 3 inches of stem attached.
Harvest buds before they start to open. If you see purple petals starting to show, the artichoke is overmature and will be tough. Check plants every few days during peak season.
After the main harvest, secondary buds may develop on side shoots. These are smaller but still tasty. Cut them when they reach about 2 to 3 inches in diameter.
Overwintering Artichokes In New Jersey
Artichokes are perennials in zones 7 and warmer, but in most of New Jersey, they need protection to survive winter. In southern coastal areas (zone 7b), you can try overwintering with heavy mulch. In northern zones, it is easier to treat them as annuals.
To overwinter, cut plants back to 6 inches after the first frost. Cover with 12 to 18 inches of straw or leaves. In spring, remove mulch gradually as temperatures warm. Success rates vary, so many gardeners prefer to start new plants each year.
Common Mistakes To Avoid
Planting too early is the biggest mistake in New Jersey. Cold soil and frost can kill young plants. Wait until soil temperatures are consistently above 50°F. Another common error is planting in heavy clay without amending it.
Overwatering can cause root rot, especially in poorly draining soil. Underwatering leads to tough, bitter buds. Find a balance by checking soil moisture 2 inches below the surface. Water deeply when the top inch feels dry.
Neglecting to fertilize is another issue. Artichokes are heavy feeders and need regular nutrients to produce large buds. Skimping on fertilizer results in small, underdeveloped artichokes.
Recommended Artichoke Varieties For New Jersey
Some varieties perform better in New Jersey’s climate than others. Look for varieties that mature quickly and tolerate cooler temperatures. Here are a few top choices:
- Green Globe: Classic variety, reliable in many climates. Matures in 85 to 100 days.
- Imperial Star: Bred for annual production. Matures in 80 to 90 days. Good for New Jersey.
- Emerald: Vigorous grower with large buds. Matures in 85 to 95 days.
- Violetto: Italian heirloom with purple buds. Matures in 90 to 100 days.
Imperial Star is often recommended for New Jersey because it produces buds in its first year reliably. Green Globe is also a solid choice for home gardeners.
Using Row Covers And Season Extenders
In cooler springs, row covers can help warm the soil and protect young plants from late frosts. Use lightweight fabric and remove it when temperatures stay above 60°F. This can extend your growing season by a few weeks.
In the fall, row covers can also protect plants from early frosts, allowing you to harvest later. This is especially useful in northern New Jersey where the first frost can come in late September.
Cold frames or low tunnels are another option for gardeners who want to push the season. They provide extra warmth and protection, making it possible to plant a week or two earlier.
Companion Planting For Artichokes
Artichokes grow well with certain plants that deter pests or improve soil. Good companions include sunflowers, tarragon, and marigolds. Avoid planting near fennel, which can inhibit growth.
Marigolds help repel aphids and nematodes. Sunflowers attract pollinators and provide light shade. Tarragon is said to improve the flavor of artichokes when planted nearby.
In New Jersey, planting artichokes near beans or peas can add nitrogen to the soil. Just make sure the legumes do not shade the artichokes too much.
Watering Schedule For New Jersey Gardens
New Jersey gets about 40 to 50 inches of rain per year, but distribution varies. During dry spells in July and August, artichokes need supplemental watering. Aim for 1 to 2 inches per week, including rainfall.
Water deeply once or twice a week rather than shallowly every day. This encourages deep root growth. Use a soaker hose or drip irrigation to keep water off the leaves and reduce disease risk.
In sandy soils common near the coast, water more frequently. In clay soils, water less often but more deeply. Adjust based on your specific soil type and weather conditions.
Fertilizing Artichokes For Best Yields
Start with a balanced fertilizer at planting time. After that, apply a high-nitrogen fertilizer every 3 to 4 weeks until buds begin to form. Switch to a balanced formula once buds appear.
Organic options include fish emulsion, blood meal, or compost tea. Synthetic options like 10-10-10 work well too. Follow package directions for application rates.
In New Jersey, a mid-season boost of compost or aged manure can help maintain soil fertility. Side-dress plants in June and again in July for best results.
Pest Management In New Jersey
Aphids are the most common pest on artichokes in New Jersey. They cluster on new growth and under leaves. Spray them off with a strong stream of water or use insecticidal soap. Ladybugs are natural predators that help control aphids.
Slugs and snails are problematic in wet springs. Use beer traps, copper tape, or diatomaceous earth around plants. Handpick them at night for small infestations.
Earwigs can chew holes in leaves and buds. Trap them with rolled-up newspaper or use bait. Keep the garden clean of debris to reduce hiding places.
Disease Prevention Tips
Powdery mildew appears as white powder on leaves in humid weather. Prevent it by spacing plants for good air circulation and watering at the base. If it appears, treat with neem oil or a baking soda solution.
Botrytis (gray mold) can affect buds in cool, wet weather. Remove affected buds and improve air flow. Avoid overhead watering during cool periods.
Root rot is caused by overwatering or poor drainage. Plant in well-draining soil and avoid waterlogged conditions. Raised beds help in heavy clay areas.
Harvesting And Storing Artichokes
Harvest artichokes when they are firm and tight, about the size of a tennis ball or larger. Use a sharp knife to cut the stem 2 to 3 inches below the bud. Store unwashed artichokes in the refrigerator for up to a week.
For longer storage, blanch and freeze artichoke hearts. Remove the tough outer leaves and choke before freezing. They keep well for several months.
Fresh artichokes can also be stored in a vase of water like cut flowers. This keeps them fresh for a few days at room temperature.
Growing Artichokes In Containers
If you have limited space or poor soil, grow artichokes in large containers. Use a pot that is at least 18 inches deep and wide. Fill with high-quality potting mix and compost.
Container-grown artichokes need more frequent watering and fertilizing. Check soil moisture daily during hot weather. Use a slow-release fertilizer at planting and supplement with liquid feed every 2 weeks.
In New Jersey, containers can be moved to a sheltered spot in winter if you want to try overwintering. This is easier than protecting plants in the ground.
When To Plant Artichokes In Different New Jersey Regions
Timing varies across the state. Here is a quick guide for major areas:
- Newark and North Jersey: Plant transplants in early to mid-May. Start seeds indoors in early March.
- Princeton and Central Jersey: Plant transplants in late April to early May. Start seeds in late February.
- Atlantic City and South Jersey: Plant transplants in mid to late April. Start seeds in mid-February.
Always check your local frost dates. A late frost can damage young plants, so be ready to cover them if needed.
Common Questions About Planting Artichokes In New Jersey
Many gardeners wonder if artichokes are worth the effort in New Jersey. With proper timing and care, they produce well. The key is choosing the right variety and planting at the correct time.
Another common question is whether artichokes need full sun. Yes, they need at least 6 to 8 hours of direct sunlight daily. Less sun results in smaller plants and fewer buds.
Some people ask about growing artichokes from grocery store buds. This is not recommended because the buds are often treated to prevent sprouting. Stick with seeds or transplants from a reputable source.
Frequently Asked Questions
What Is The Best Time To Plant Artichokes In New Jersey?
The best time is from mid-April to early May, after the last frost. Coastal areas can plant a week earlier. Start seeds indoors 8 to 10 weeks before the last frost.
Can I Plant Artichokes In The Fall In New Jersey?
Fall planting is not recommended because artichokes need a long growing season. They are usually planted in spring and harvested in late summer. Fall planting would not allow enough time for maturity.
How Long Do Artichokes Take To Grow In New Jersey?
From transplanting, artichokes take 80 to 100 days to produce harvestable buds. From seed, it takes about 120 to 150 days total. This is why starting seeds indoors is important.
Do Artichokes Come Back Every Year In New Jersey?
In southern coastal areas (zone 7b), they may survive winter with heavy mulch. In most of New Jersey, they are grown as annuals. Overwintering is possible but not guaranteed.
What Is The Best Variety Of Artichoke For New Jersey?
Imperial Star is the best choice for annual production. Green Globe and Emerald also perform well. Choose varieties that mature in under 100 days for best results.
With the right timing and care, growing artichokes in New Jersey is rewarding. Start your seeds indoors, wait for warm soil, and give them plenty of space and nutrients. You will be enjoying homegrown artichokes by late summer.