SproutSmart
SproutSmart™ Intelligent Garden Sowing

Arp

Rosemary
Zone 4a Save Garden

Planting Schedule

Add Arp to your garden to build a schedule and get reminders.
Botanical illustration of Arp
90d to harvest

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.

Crop Dates

MilestoneDate
Start IndoorsApr 17th
Last FrostMay 15th
Transplant / Sow OutdoorsJun 26th
Harvest BeginsSep 24th
Harvest EndsSep 24th

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

Today's Conditions

Outdoor planting for Arp in Zone 4a typically begins around 2026-06-26. Wait until soil reaches at least 60°F before transplanting Arp.

Garden Alerts

In Zone 4a, the average last spring frost is around May 15. Watch soil temperature before transplanting Arp.

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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.
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.

Today's Conditions

Outdoor planting for Arp in Zone 4a typically begins around 2026-06-26. Wait until soil reaches at least 60°F before transplanting Arp.

Garden Alerts

In Zone 4a, the average last spring frost is around May 15. Watch soil temperature before transplanting Arp.

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.