When to Plant Alliums in Somervell County, TX
Your June planting checklist for Somervell County, Texas
Welcome to June in Zone 8b. These are the moves that will have the biggest impact on your growing season.
Ornamental alliums (Allium spp.) bridge the gap between spring and summer with their striking globe-shaped flower heads in shades of purple, violet, white, and pink. Blooming after tulips have faded, they extend the spring display well into early summer. 'Gladiator', 'Globemaster', and 'Purple Sensation' produce softball-sized heads on 18–36 inch stems, while smaller species create charming accents at border fronts. Deer and rodents shun them completely due to the characteristic onion scent. Dried seed heads provide architectural interest into fall.
Somervell County, Texas is in USDA Zone 8b. The average last spring frost is March 19 and the first fall frost is November 12, giving you a growing season of approximately 238 days.
At an elevation of 4,773 feet, Somervell County receives approximately 64.7 inches of rainfall annually with predominantly clay soil. Summer highs average 90°F, providing good warmth for Alliums during the growing season. Clay soil retains moisture well for Alliums, but amend with compost to improve drainage and prevent root rot. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Alliums root diseases.
Somervell County Soil Profile
Soil Type
Clay
Soil pH
7.2-7.8
Drainage
Well Drained
Alliums Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
Soil Compatibility in Somervell County
How your county's soil matches Alliums's growing requirements.
Soil pH
Your soil pH (7.2–7.8) overlaps with Alliums's range (5.5–7.5), though not a perfect match.
Soil Texture
Heavy clay soil (46% clay) in Somervell County compacts easily and drains slowly. Amend with compost and avoid working soil when wet.
Organic Matter
Organic matter is moderate (3.3%). Annual compost additions will help Alliums.
How to Plant Alliums
Fall planting: Sow 4 weeks before your first frost date for a fall harvest.
Succession Planting Alliums
Sow every 3.1 weeks. Last sowing by Oct 01 to harvest before frost.
For a dedicated fall crop, sow by Oct 15.
Alliums Water Budget
Water stress score is 6/10 — consider drought-tolerant varieties and mulching
Monthly Watering Guide for Alliums
Alliums needs approximately 0.5 inches of water per week (2.2" per month). Here's how your county's rainfall compares month by month.
| Month | Alliums Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 1.8" | 0" | ❄️ Dormant |
| Feb | — | 2.4" | 0" | ❄️ Dormant |
| Mar | 2.2" | 4.3" | 0" | ✅ Rainfall sufficient |
| Apr | 2.2" | 6.9" | 0" | ✅ Rainfall sufficient |
| May | 2.2" | 10.2" | 0" | ✅ Rainfall sufficient |
| Jun | 2.2" | 10.5" | 0" | ✅ Rainfall sufficient |
| Jul | 2.2" | 7.5" | 0" | ✅ Rainfall sufficient |
| Aug | 2.2" | 7.8" | 0" | ✅ Rainfall sufficient |
| Sep | 2.2" | 5.4" | 0" | ✅ Rainfall sufficient |
| Oct | 2.2" | 3.8" | 0" | ✅ Rainfall sufficient |
| Nov | 2.2" | 2.4" | 0" | ✅ Rainfall sufficient |
| Dec | — | 1.7" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Somervell County). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Alliums Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Alliums Planting Timeline — Somervell County, TX
Alliums Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Bloom | November 12 | Nov 12 – Dec 3 |
| Fall Sowing | October 15 | Oct 15 – Oct 29 |
Plant 5" deep · 7" apart · Rows 8" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | — |
| March | — |
| April | — |
| May | — |
| June | — |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | Bloom |
| December | Bloom |
Growing Conditions
☀️ Sun
Full Sun (6-8+ hours)
💧 Water
0.5"/week · Natural rainfall sufficient
📅 Days to Maturity
28–42 days
🧪 Soil pH
Needs 5.5–7.5 · Your soil: acceptable
🗺️ USDA Zone
Zone 8b
📆 Growing Season
238 days in Somervell County
Growing Tips for Alliums in Somervell County
Direct sow Alliums outdoors after March 19 in Somervell County when soil has warmed and frost danger has passed.
With Somervell County's clay soil (46% clay), work in 3-4 inches of compost before planting Alliums. Avoid tilling when soil is wet to prevent compaction.
Your generous 238.0-day season in Somervell County allows multiple plantings of Alliums. Sow every 14.0 days for continuous harvest.
Common pests for Alliums in this region include onion maggots and thrips. Use row covers early in the season and inspect plants weekly.
General growing tips
Plant bulbs in fall, 3–4 times as deep as the bulb diameter (typically 4–6 inches for large types, 3 inches for small species). Space 6–8 inches apart for standard cultivars. Foliage often looks untidy as it dies back before bloom — plant around perennials that will conceal the yellowing leaves. Excellent drainage is essential; alliums rot in wet soils. Leave bulbs in place for naturalization; divide every 3–4 years when clusters become congested. Deadhead spent globes or leave for ornamental seedheads and self-sowing.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Alliums in Other Locations
Frequently Asked Questions
When should I plant Alliums in Somervell County, TX?
Somervell County is in Zone 8b with an average last frost of March 19. Plan your Alliums planting based on this frost date — see the calendar above for exact timing.
What planting zone is Somervell County, TX?
Somervell County, Texas is in USDA Hardiness Zone 8b. The average last spring frost is March 19 and first fall frost is November 12.
Your Somervell County Garden Planner — Free
A 22-page printable planner built for Somervell County (Zone 8b). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.