SproutSmart
SproutSmart™ Intelligent Garden Sowing

Arp

Rosemary
Zone 12a Save Garden
Botanical illustration of Arp
🌱 90d to harvest Upright

Fragrant as a sunlit hillside, Arp rosemary fills the garden with a resinous, pine-needle perfume and delivers bold, savory sprig…

Planting Schedule

Add Arp to your garden to build a schedule and get reminders.

Crop Dates

MilestoneDate
Start IndoorsDec 4th
Last FrostJan 1st
Transplant / Sow OutdoorsFeb 12th
Harvest BeginsMay 13th
Harvest EndsDec 31st

Crop Details

TraitValue
Days to Maturity90
Sun RequirementsFull SunFull sun
Growth HabitUpright
Support NeededNone
Planting DepthNormal
Germination Temp (°F)70
Min Soil Temp (°F)60
Min Night Temp (°F)35
Harden Off (days)7

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Frequently Asked Questions

How do I manage powdery mildew on Arp squash (or squash-type cucurbits) during warm, humid weather?
Powdery mildew shows up as a white, dusty coating on Arp leaves, often starting on older foliage. Remove the most infected leaves early and space plants farther apart to improve airflow; water at the base so the leaves stay dry. If it keeps spreading, spray an approved powdery mildew fungicide labeled for cucurbits and repeat according to the label interval.
How often should I water Arp during the main growing phase to avoid stunted growth and poor fruit set?
From flowering through fruit enlargement (roughly mid-season to around the last few weeks), keep the soil consistently moist but not soggy—aim for about 1 inch of water per week total, split into 1–2 deep waterings. Check by pushing a finger 1–2 inches into the soil; water if it feels dry at that depth. Avoid letting the soil fully dry out between waterings, since Arp cucurbits can drop blossoms and develop small, uneven fruit.
When is Arp ready to harvest, and how can I tell without guessing?
Harvest Arp when the rind has fully hardened and the fruit has reached the mature size for the variety, typically around 90 days from sowing. The skin should be difficult to puncture with a fingernail, the stem should begin to dry, and the fruit should sound a bit more solid when tapped. Cut the fruit with a sharp knife, leaving a short stem, and cure it if your storage needs require it.
Botanical illustration of Arp

Fragrant as a sunlit hillside, Arp rosemary fills the garden with a resinous, pine-needle perfume and delivers bold, savory sprigs that hold their character from fresh harvest to drying. The foliage is deep forest-green and notably aromatic, with a refined, upright habit that makes it easy to gather generous armfuls for flavorful bundles. Arp is a standout for home gardeners seeking a reliable, long-season rosemary for seasoning blends, infusions, and aromatic oils—an herb that turns everyday meals into something memorable.

Sowing Tips

Transplant Conditions

Wait until soil reaches 60°F and nights stay above 35°F before moving outdoors. Harden off for 7 days first.

Expert Note

Start indoors early for stronger roots, but transplant only after nights are consistently mild to avoid cold stress even for hardy rosemary.