Summerlong Basil

Long Lasting Cold Tolerant Basil Variety

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Full Sun

Genus: Ocimum

Species: basilicum

Common Name: Summerlong

Hardiness Zones: 4 to 10

Soil pH 5.5 to 6.5

Days to Maturity: 60 to 90

Plant Height: 8 to 10 Inches

Spread: 4 to 6 Inches

More Cold Tolerant than other varieties of Basil


A dwarf basil developed by Burpee that averages about 10 inches tall. What it lacks in height it makes up for in vigor. Summerlong retains its bushy stature and produces longer than other varieties. It is somewhat cold tolerant so far as basil is concerned and is less likely to bolt to seed unexpectedly. It also matures fairly quickly 30 - 60 days for young basil leaves, 60 to 90 for full maturity.

Basic Care of Basil

Water - Basil requires ample and persistent water. Mulch to retain moisture in warm weather is advisable.

Delicate flowers on Basil are attractive however they are a sign your plant is going to seed and production will decline at this point. If you are not looking to harvest seeds, you should pinch off any flower stems as they appear.

Temperature - Basil thrives in warm temperatures and heat. It will turn black and die off in temperatures approaching the mid 30s F. Temperatures should be at the very least in the 70s around the clock.

Optimal Growth Temperature 65 to 85 F

Germination Temperature 70 to 75 F

Pests and Disease


Basil has some enemies, Beetles, particularly Japanese Beetles, love Basil as much as people do and have been known to completely skeletonize whole plants. Aphids are also a problem at times. Most varieties are also subject to various plant diseases such as black spot, gray mold and fusarium wilt.